Happy I watched complete All-22 yesterday and commented on this in other JA thread. I have to look it up again (cannot right now), but I am fairly certain it was almost impossible to throw this even with anticipation before the pocket collapsed. Beasley's route just did not develop enough.
When Beasley was changing direction Allen was already scrambling to the right. I am not sure if he saw Beasley, and if he did, I think he had time to set his feet and find him. But without setting his feet it would be extremely hard throw since he was scrambling to the right, Beasley was open in the middle and it needed to travel ~35y in the air over defender. I do agree that this was a miss, just not sure how much we can "blame" Allen for not throwing to Beas.
I found one more obvious miss IIRC in the whole game btw.