It's a combination of teams keying on him, his ankle, and the fact that this OL is not maulers so they do a lot of zone run blocking which requires patience - something he doesn't seem to have right now. Reggie is hyper and wants to make a big play every time he touches the ball. And yes, I still think he's getting drilled that the edge is harder to come by in the NFL, but not impossible - despite NFL speed, we're not sealing off the edges either. We tried twice in the Tampa game (designed runs to the edges) and Stecker whiffed on a block and Karney missed a key block on Simeon Rice. Both resulted in hits in the backfield.
All of this is fortunately fixable and coachable.
If the problem was passion or character, I'd be concerned.