I'm gonna stop because we're going in circles. Once again, your premise is wrong.
You don't blame success. The fact that you're defining success as finishing a game farther ahead in the score than you went into the 4th quarter doesn't make that definition hold for the rest of the universe. They count wins - not 4th quarter wins.
I can only state the reality that he's the single most effective coach/play-caller at successfully finishing games with a 4th quarter lead so many times before recognizing that you're deadset on ignoring that fact in order to maintain a position of second-guessing him by ignoring half of the risk/reward equation in your hypothetical scenarios and steadfastly arguing about why he's a failure in the very area in which he in fact has achieved the greatest success in the league.