I mean didn't the Chiefs do this all the way to a Super Bowl championship?
Caleb is in no way accomplished enough to be compared to Mahomes....yet. But just in terms of the sustainability of comebacks, I feel like those can be an integral part of a team's long term success provided it speaks to the talent, especially at the quarterback position.
We will see. I don't want to completely discount the notion that it's not sustainable because we haven't yet seen it sustained for long enough. But a lot of these arguments amount to "X team lost because they didn't play good enough to win." It's just that the person making the argument isn't accepting that. It's the luck argument but put into different terms.
Saturday the Packers: 1) lost the 2nd half decidedly in multiple facets of the game, 2) were fooled on defense by a number of well-adjusted Ben Johnson calls that built on the 1st half, 3) missed field goals/XP because they have a kicker who isn't very good, 4) generated very little pass rush because they lost their best pass rusher to injury and injuries are something every team deals with, and 5) couldn't stop the QB who has authored the most 4th quarter jaw-dropping comebacks in the league this year.