No, what my point says is that over two years with the Bills, Rex coached them to 2 wins over teams with winning records, and one of those is an iffy win at best. It means his teams tended to mentally melt down and make mental errors continually throughout the 2 years, especially when put under pressure by better teams. And yes, Bills teams have done that for 17 straight years, does not mean we should accept it any more now with Rex as coach as we did with Chan, Dick, Doug etc. The Bills can and should be better at coach.
To say the exact same personnel and conditions and schedule will exist next year so you can judge side by side is "simplistic" .