[RiggoRules]

Here is one obvious difference that is going to have an impact (but no one is talking about):

Campbell throws with his right hand.

This will have a direct impact on protection (good or bad? we'll have to see, but it will have an impact).

It will also impact coverages and how the receivers catch the ball.

Also, Campbell can not only throw deep, but he can also throw the out routes that #8 simply has not executed as a Redskin.

His delivery is very smooth, but it takes a while for him to get the ball out of there. His mobility and strength will allow him to make up for that.