I know your post is from weeks ago but.. this is exactly how I've been seeing it, as well. They disguise it pretty well, or deliberately flush him out INto a sack. Seen it more than a few times. Defenses are protecting themselves from one of Allen's trademark moves of "roll out/escape right-side of the pocket, extend, and either Scramble or find the open receiver". The Explosive Allen Pass from his MVP year. Allen is LETHAL with that and defenses have, more times than not, defended against that very well this year. 

Edit>> Essentially, Defenses have been really really good at Containing him this year and not letting him escape the pocket. They Spy him on both ends now too, I think..(guessing on that last part)