Here's what happened. The Patriots outmaneuvered everyone again.
Let's look at the Patriots moves that ended up with that 3rd. rounder for Solder with Trent Brown taking his place at LT.
First, Solder signed with the Giants for 4 years / $62 mil. The size of a FA contract is the primary determinant in awarding comp picks. Solder's deal certainly qualifies for a 3rd. rounder.
That left a big hole at the Patriots LT position. So, who did the Pats replace Solder with? In the middle of the 2018 draft the Pats traded their #95 pick for Trent Brown and SF's #143 pick. Brown cost the Pats the equivalent of a 4th. round pick with Brown carrying a $1.9 mil cap number last season. SF considered Brown expendable after drafting McGlinchy.
There's more than "outmaneuvering" going on here. Who should have known Brown better than the 49er's? They figured they needed an upgrade and drafted McGlinchy. The Pats won a Super Bowl with that cast off LT. The 49ers could have kept Brown and used that #9 pick elsewhere.
Now, did Belichick intend to start Brown at LT? No. The starting point was Cannon moving to LT with Isaiah Wynn, their first round pick, taking Cannon's spot at RT. But Wynn blew his Achilles in the second preseason game, ending his season. Plan B was moving Cannon back to RT with Brown starting every game at LT doing what he was signed to do: provide injury insurance or insurance against Wynn not working out at RT or necessity requiring Wynn moving to OG. That's a heck of a Plan B.
Was Belichick just lucky that Brown played as well as he did, not great but pretty good and good enough? Well, first of all, in making that trade, Belichick saw more value in Brown than the guys who should have known him best. That's not "outmaneuvering". That's insight into talent, value and fit, not just Brown's but also Solder's, not just some cagey manuever to get a comp pick. Then there's Belichick's ability to get guys to "do your job" in the way he defines that job. If luck is opportunity meeting preparation, then we could say Belichick is lucky. And nobody is "luckier" than Belichick.
Brown is now a free agent. Will Belichick re-sign him? Maybe not, then the Belichick wheels will get turning once again if Wynn is not ready. Even if Wynn is ready, Belichcik will be looking for that next value Plan B and the wheels keep on turning.
With 6 picks in the first 3 rounds, we'd expect nothing less than Belichick wheeling and dealing in the upcoming draft. Gutekunst should keep him at the top of the speed dial list.