Of course, I'm not sure Dallas needs a deep threat for the next 4 weeks...Johnson does not exactly have the ability for the long pass these days...
He didn't exactly have that ability 5 years ago when he won that Superbowl. If the Cowboys are going to make big plays in the passing game over the next few weeks, they'll have to rack up a lot of yards after the catch.
BJ is good at getting rid of the ball quickly though on short routes. If you saw the Bucs/Eagles NFC Championship game a few years ago, that was how he carved them up, and more importantly, that was how the Bucs were able to avoid the Eagle's crazy blitz schemes. 3 step drop, ball gone. If he can still do that, it could work. It would also help a struggling offensive line.
Of course, the guy's so immobile, and so old, that he might be on IR by the second quarter this Sunday.