I'm not sure it's lack of physicality that's Graham's problem, he's proven after the catch he can be very physical. I think teams now know what type of player/assignment that best fits the matchup, so he is going to not get as many easy receptions. Now that Graham is facing good CBs he has to refine his technique. When you are playing opposite of good defenders, everything counts. He's never been a good technical player, and that has a lot to do with being late to the sport/position.
Things that stick out to me:
Breaking on the ball: he doesn't snap to ball very often, he kind of just wait for the pass to get to him. His long arms and tall stature allow him to make great catches by reaching for poorly-thrown balls, but he has to get better at closing on the ball when the pass is in contention with a very good CB.
Anticipation of the hit: I think this is what gives people the idea that he isn't physical. When he is playing close with another defender he tends to clam up before the catch, not utilizing the full extent of his arms (alligator arms). He needs to work at this - it's very un-nerving as a player and not bracing for a hit since you are doing exactly opposite of what human nature is telling you.
This post was edited on 7/9 at 9:09 am