Anyone who has played any form of receiver (WR, TE, RB) knows that the reason a player jumps to catch a football primarily are due to 2 things:
- The receiver does not trust their own hands
- The receiver is scared to be hit and/or injured
I know the second point has been made on this thread, but if you watch Vernon throughout the years, you can tell the issue is primarily that he does not trust his hands. Why? Because when there is no deep DB to hit Vernon and he still jumps up to catch the football, it has nothing to do with the possibility of being hit. There's no one to hit Vernon. He does not have good hands. I don't know if Vernon has small hands, so it's hard to criticize him for doing this.
But from a very basic, fundamental point of view, he needs to understand when you jump and when you don't. The perfect example of how ridiculous this can get is the picture posted by @cwilson830 vs the Rams. Hopefully VD and Crabtree are able to spend some time at training camp for once and they can exchange notes. He IS a hard worker and hopefully this is something he gets better at.
At the end of the day, catch the ball. There is no YAC if there is no catch, so if he's going to drop the ball with his hands, then so be it for now. We're in the playoffs; not something to criticize until March.