Isn't this basically the defense that Rex, the Defensive genius, destroyed? The new Bills regime brought them back to where they should have been. That is good and to their credit. Rex did prove that bad coaching can screw up good talent.
The one area that I think the new regime has failed, is at QB. They mishandled it last year and totally blew it this year. The one redeeming thing they have done is drafting Allen, but they didn't set him up to succeed. Allen was put into the line-up prematurely and has miraculously survived the season despite the o-line. They were even fortunate enough to have him get injured, which forced them to deal with the ineptitude of Peterman. They got lucky when Barkley became available, and in the end, they did get two real mentors in here for Allen. But none of that was by design.
Nonetheless, yesterday showed they have someone to build around. So, the next two season will be the real judge of this new regime. I for one, hope it goes perfectly, whether, by design or luck, I don't care. Just win!