I think the stagnation or regression with Allen, and Allen locking onto targets or not doing as well in the pocket is attributable to having an OC and HC who: (1) don't know how to use JA appropriately (up-tempo); and (2) have no clue how to teach him to be a more effective pocket passer.
I think you redo the coaching staff, hire Ben Johnson, have JA go to the QB clinic he went to in prior offseason, and you'll see a massive improvement.
Also, having another WR to throw to.