For Allen's development, sure. And let's not forget - the chances of Allen developing as he has done were so minute. I think some Bills fans now take that for granted.
But i think even more credit goes to Daboll for the environment, scheme, development & usage of other players on the offensive side of the ball.
He temporarily resurrected John Brown's career. Then Diggs developed from a promising but enigmatic player into one of the league's best. Beasley played the best football of his career into his 30s, Knox went from very raw prospect to 'well above average' receiving TE. Other diamonds in the rough such as Davis & McKenzie developed under his watch. I'm not saying all credit goes to Daboll... But all of this happening is no accident.
I think he's generally under appreciated by Bills fans & i hope the HC role in New Jersey isn't one step beyond him. I hope he kills it there (unless playing Buffalo ofc) .