I wonder if that isn't being overlooked here. He hasn't looked as spry or agile this year even on the occasions where he has gotten the ball in space.
I think people overrate his receiving ability though. He has a career aDoT of 0.2 and has never caught a ball 10+ yards downfield in his entire NFL career. In college he caught a bunch of dumpoffs/screens and had all kinds of running room against overmatched competition. In the NFL he hasn't been able to do the same with those dumpoffs/screens, especially this year on the tender ankle.