Tuck rule was more a BS interpretation of a BS obscure rule that no one seemed to know about, although it did exist. Much like when Polamalu got fucked out of an interception against the Colts in the playoffs because of the "make a football move" rule, where apparently catching the ball and going to the ground didn't count as such. Where, by the letter of the law, it may have been the right call, but the logic behind it just seemed fucked in the head.
This was simply a horrible miss of a very obvious infraction. Technically two infractions, I guess, as it was both PI and helmet-to-helmet. To me, it may be because it's just the most recent bad call, but it feels like it could be the worst, simply because of how obvious the penalty was, the timing of the no-call, the end result of the game and the simple fact that you have refs making all these ticky-tack calls, 50/50 calls and so on (not saying they're "wrong" calls, but just that they are subtle penalties that may not have even had a real impact on the play) and then go completely blind when a glaringly blatant penalty is committed.