The key to it all is, dare I say it, that growth mindset McD preaches. The humility and resiliency to invite discomfort and uncertainty in the pursuit of improvement. Credit AJE for possessing the DNA to re-create himself as a football player, and big credit to the Bills organization for identifying in him the potential to do so.
I really thought his best fit in the NFL was as a 3-4 DE/5-technique guy, which might have meant even GAINING a few pounds. But that was the narrow view that strength and length were his only NFL traits. The Bills, on the other hand, seem to like to project how these specimens might grow into more dynamic roles.