Point taken on the trade-up.
All of the lightweight 3-4 OLBs have trouble disengaging from a decent block in the pass rush. They win on burst, quickness, evasion (swim, lean, hand work), deception (stunts, spins). Watch Matthews sometime (as if that recommendation is even required
). If the OT gets both hands on him off the snap, he's done for that edge rush, though his second effort to underside when the QB steps up and in pursuit can't be underestimated. The same can be said for the run game; he compensates for his size in edge contain by maintaining outside leverage; he's vulnerable to the cutback. you're just not going to see him stand up an OT and slide off. He compensates by being perhaps the best 3-4 OLB in backside pursuit. It's a matter of physics...you're not going to get Peppers-like shedding ability in a 245 lb. athlete.
I don't see where Harold was asked to play in space or coverage that much. From what I've seen he was an elephant in a multi-scheme, sometimes a DE (even in a 3 man front at times) or rushing the passer standing up (where he pops off the tape).
He looks lean at 6'3", 247 and could add some muscle for the run game. He agrees.
It's fairly common for edge rushers to be limited to that role as a rookie. Many were not asked to do much down field in college and have a learning curve.
You just can't teach burst, motor and 4.58 speed...that's an athletic platform to work with.
For what it's worth, Harold's Combine measurements are nearly indistinguishable from Matthews'.