I think it's a bit more complicated than just "getting hot" for a stretch. These past couple SB winners
1) have been extremely well-coached.
2) have dominated the game in the trenches
3) have gotten enough from their QBs to put them over the top.
For every Giants and Ravens squad out there, you also see 4-5 other teams from each conference who are brutally exposed in January.
It's not just about getting into the dance like Jerry wants the fans to believe.