Interesting take, I hadn't thought of KC & being viewed as underachievers but maybe in time?....I think (could be off here) that teams like GB could be viewed in that lens, to a degree, through the Favre & Rodgers years. Certainly didn't maximize their potential in terms of SB rings. New England and Brady certainly wouldnt be viewed as underachieving by any rational standard but that was a rare long-lasting combo of elite QB having a surrounding team + Coach that also stayed good/great at the same time. Have to go back to the Landry/Staubach, Lombardi/Starr, and Browns of yore to find franchises that seemed to maximize rings (and NFL Championships pre-SB). Random thoughts...