Rosen looks awful. He looks like Peterman from the Chargers games most of the time. If he could run, it would help his game for now. But he can't. He's slow.
So, the big question is: given equal offensive lines and weapons, who is the better passer?
It's hard to know because both have lousy OLs and very few weapons.
The big difference is that Allen can run and Rosen can't. So, in the short term Allen can produce while Rosen cannot. But with good OLs and receivers and backs who will be the better passer?
Even if Rosen becomes the better passer, he will never have the running ability. But will Allen stop running so much and throw in the future with better players?