Looking at past SB winning coaches there is very often one common thread - they are NOT re-tread head coaches. They are most often young (relatively), innovative assistants - Landry, Shula, Noll, Belichick. There's a reason no head coach has won a SB with 2 different teams - they get stale and set in their ways.
And usually coaches win SBs relatively early in their career - Reid and Belichick are the exception, and Reid possibly just got lucky with Mahomes. Landry won a SB in his 11th and 17th years - never again in the next 12 years. Shula won in his 4th and 5th years with the Dolphins - never gain in another 22 years.
No more McCarthy, Parcells, etc....