Saying one play was the deciding factor in the outcome of a game is bull schmidt.
If TK didn't throw that pick-6 we win.
If Hunnycut doesn't miss the FG before half time we win.
If Hunnycut doesn't miss the FG late in the 4th we win.
If the XP isn't blocked we win.
That's over simplifying the situation. The outcome of a game is the culmination of every single play in the game. I hate the 'IF' game. It's what losers do. In the end they're just excuses. Nobody is taking responsibility and that sucks.
As Yogi Berra once said, "we made too many wrong mistakes today".