I don't understand why you think this. Inside/Middle Linbackers get fewer chances to rush the passer. Putting him inside will give him less sacks. We have history on this: See 2015, when he was primarily an ILB. 6.5 sacks.
Why do you think this? CM was at best, a middling ILB. He's athletic and smart, but he takes false steps and poor reads at times. He disappeared in two games. Against Oakland and Arizona, he was blanked entirely from the stat sheet. Not that total tackles are a good measure of a player, zero from an ILB means something is wrong.
OK-let me break this down extensively. Clay's best year as a pro was probably 2010 (our most recent SB year); as a young outside backer playing with his hair on fire he totaled 54 tackles, 13.5 sacks, 4 passes defended, 2 forced fumbles and 1 pick six INT. In 2012 he had 13 sacks, which garnered him getting his fat contract extension.
There are two Clay's though-the rookie contract Clay and the second contract "hurt" Clay. Since his natural trade is as a pass rusher-let's start with analyzing his production in getting to the QB. Since 2013 he has averaged 7.5 sacks a season. Before 2013-just over 10 and a half. I think the difference is due mainly to his health. It's been up and down over the last few years, and it's been a problem for the defensive continuity in the front seven. I think the other issue has simply been Clay's style of play that I think contributes to his health problems. Think the Tiger Woods swing torque/back problems effect. Clay has good bend, but not Von Miller bend. Matthews has been utilizing a combo of quickness to engage/strike, speed around the edge, and strength to battle men that outweigh him by around 50 pounds on average every Sunday. This has to be taking a toll on him physically, when you do it snap after snap after snap. Then, when you look at how Clay plays, you have to consider the fact that he is going up against pros. They look at game tape/study their opponents too. How many times have we seen an offense run off-tackle for chunks of yards right at him in a two-point up-right stance gearing up to set the edge (yet still getting blown off the LOS) OR the 7 hole opening up right where Clay is screaming past in an attempt to get wide and around a LT. Clay has some moves, but most of them are predicated on speed; he doesn't overpower tackles regularly. He isn't crazy long, and has slightly lost a step from when he was a young bull out of the gate. You can see that offensive lines don't fear Clay as much just from his rushing on the edge; they fear him when they don't know where he is coming from.
So, why is Clay still perceived as a "star"? Well, because he had a year like 2014-his best in my opinion as a Packer. He was forced to play outside on both sides and at MLB due to injuries/production issues in run defense. He answered the bell, amassing 52 tackles (2nd most of his career for a season) 9 passes defended, 2 forced fumbles and 1 INT. He also got 11 sacks. He was all over the field, making plays sideline-to-sideline. He was amazing, even though he was technically playing "out-of-position" often as an inside backer.
Clay's speed and motor make him naturally a fit to be disruptive in the middle of the field. In 2011 and 2015 he made the Pro Bowl off of reputation. But if you look at his play over the years, it has been up and down, because when all he is asked to do is be some sack-meister, you get mixed reviews. But make Clay a factor in the middle of the field, and he is "Claymaker" again. Yes, as an ILB he takes some false steps. But he always has been good at diagnosing pre-snap/reading and reacting, which is the only reason why the coaches felt they could move him inside and it would work in the first place.
I think for Clay, his career can be rejuvenated and lengthened by making a switch to playing 70-75 percent of his snaps inside our 3-4/2-4-5, and then getting the rest on either side of the edge. To me, that would make him like a WILL backer in our scheme. It best accentuates his play style and abilities, while also accommodating his susceptibility to injury. I think he can hold up playing more inside than out; I think Clay is an albatross for as long as GB keeps him around if they think they can just put him at ROLB and expect him to be some premier #1 EDGE guy like Von Miller. He won't even be on the field much, or when it matters most.
For the Packers, it is equally beneficial. Off-the-field, it gives you as an organization the logic behind making Clay take a pay cut. Restructuring his salary could add years to his contract, promising him a chance at competing until he's ready to hang 'em up with the only franchise he's known. It'd also free up salary cap space to be used on other key young guys we need to lock up. It also fortifies the whole "Packer" approach of being for the organization. It seems like Ted and the front office are always looking for players to take discounts to stay in Green Bay for the culture when other teams are throwing $$$ at them during free agency, even if they are producing at a level that would garner them to receive more than market value. Clay has played under market value for years now and is still making #1 EDGE guy in the NFL money. He should be sacrificing for us and not treated like a diva. If it's good enough for everyone else not named Aaron to do, it should be for him. On the field, it makes way too much sense. You get one of, if not your best, front seven players when healthy in the best positions to make plays. On early downs, he can be on the inside, making the run defense and pass defense better with his speed/athleticism traits. Blake or Jake are not Clay, even at this point. They are old-school ILBs-which is fine-but not enough. Jake is a thumper. Blake is more athletic/smaller than Jake with really good instincts/read and reaction traits as an inside backer. Clay is a PLAYMAKER, even with his shortcomings from lack of experience playing inside. He's a better athlete than both of them and is best suited inside at this stage in his career. Jake and Blake playing alongside Clay would also make them that much better. On 3rd/obvious passing downs, you can get creative with Clay, and move him all over. That way, he never gets bored, and feels like the catalyst that he is for the D. The key is trying to keep him in the middle of the field as much as possible, so that he can run sideline-to-sideline without the offense knowing where he is attacking from when he does actually blitz. Clay is deadly shooting through A gaps. If he improves stunting through B gaps from the inside/limits his false steps/improves his fits and cover skills, he could be a top ILB well past his prime, and play alot longer than he may even think he can. He would actually be more productive than he has been because he could be a 60 tackle/7.5 sack/3 FF/5 PD/3 INT-type defender for 3-5 more seasons, the type of athletic inside linebacker we NEED to match up with the offenses in the league now. That would solve alot of problems for us; if we also went out this year and got some veteran pass rush help/make sure to plan a safari trip for elephant-hunting in next year's draft-it means we could go on a Patriot-esque SB run.