They changed this not too many years back, because the coaches on the successful teams were being screwed out of opportunities. Don't see this changing. It is certainly not tampering.
The last time an HC Combo won their first super bowl together after their fourth season together was John Madden and Kenny Stabler in the 70's. Anything is possible, some outcomes are more predictable than others.
Yesterday the Kansas City Chiefs score 27 points against the 9-8 Jacksonville jaguars. When all is said, and done a pretty average NFL offensive performance.
He is five years older than Sean McVay. McVay has already won a super bowl as a head coach. My guess is that Dorsey does not see himself as too old for an HC gig.
And yesterday was pretty good he led the offense to 34 points against a pretty good defense. And Shakir (drop 7) Knox (drop 4) and McDermott (not taking a field goal) left another 14 points on the field.