Not sure if you are basing this on what you saw in TB - when he wasn't yet in 'game shape' , and also playing with some hesitancy in a new system - having to think some and not just doing.
To me this move really is for the playoffs. He has weeks to get his body in game shape. And no one doubts he knows the offense like the back of his hand and Josh and him have a connection that takes years to develop - which is the most important aspect of what they will be asking him to do (get to the right spot at the right time and catch the ball for 1st downs). I'm willing to let it play out over the coming weeks.