It was only a 5 point lead, it was a very losable game for the Colts. Really in some ways Polian is damned no matter what, if they beat the Jets it “proves” they could have continued the perfect run, if they lose it “proves” they sacrificed the perfect run for nothing.
The fact that they held the Jets season in their hands is why he'd catch hell if they lose today. If they lost to San Diego instead it wouldn't be an issue at all.