Bronco, success is not measured by solely by winning... that is only one of many important measurements... within the realm of maintaining proper balance....Success is winning just enough to stay in balance... (keep the job)
I'm pretty sure Bronco would agree, that the "top" for him as been reached every year because he has maintained perspective, and priorities and balance, while keeping his job....
as long as he consistently wins more than he losses... the model is working....perfectly.
Under this model, undefeated would only prove occasionally you can string together more wins.... but the philosophy of success is the same 12-0 or 8-5
imo