Kincaid wasn't the first read in the play that was called, though. It was a three-step drop out of shotgun (such a dumb play call on 4th and 1). Even if Allen decides pre-snap that Kincaid is his first read and Allen throws to him at the end of his drop, the defender likely closes in on time to knock the ball out or tackle Kincaid short of the first. That would be a very risky throw to attempt on a 4th down.