I agree that Allen has probably lost trust but McKenzie’s role should be that of a gadget guy, motion, quick snap toss plays, not a slot receiver. His contract basically pays him for the gadget guy and they hoped he could carry the water in the slot. Crowder was signed as the slot and when he went down, the O started puttering. They needed to fill that position sooner.
Also, I have it from a very good source that’s tied to the receivers room and Beasley, that this has been in discussion for quite a while, at least 4-6 weeks if not longer. I do not have info what the hold up was but if I were to guess, it was creating cap room.