I understand where you're coming from, but some counter points:
-1182 of the Bills rush yards are from ball carriers other than Allen, and clearly the OL is involved in those
-I can not find stats on how many of Josh's rush yards are designed QB runs, but it's not inconsiderable; contrary to what some think, he has not gained 706 rush yards entirely on broken play scrambles. The OL blocks and breaks him lose on a number of them, or at least draws the defense off in another direction.
-On a number of key throws in games, Allen has had superb protection
-On watching all-22 film, it can be seen that on a number of passing plays where Allen extends and buys time, he had an option (or more than one option) underneath that would have gotten the ball out while the OL protection still held
-When Allen does extend plays or scramble, the OL continues to block for him, adjusting to where he has moved.
I believe @BarleyNY critiqued this stat and had a better source, but pro-football-reference gives the Bills the 6th most "pocket time" in the league at 2.5 seconds. They define Pocket Time as "average time the QB had in the pocket between the snap and throwing the ball or pressure collapses the pocket, in seconds"
Football is, and will always be, a team game. Allen is a special player, and regularly makes plays only 1 or 2 other guys can, but there is just no way Allen (or any footballer) creates an entire winning gamefull of plays all on his lonesome without help from the OL.