No coach has ever won a SB with two different teams, so no need to get excited about him.
That is a useless/irrellevant stat.
First of all... the SB has only been around for like 45 years. Second of all, back in the olden days, teams weren't switching coaches constantly. Third of all, Gruden has never coached Romo before.
Holmgren should've done it if the refs didn't have money on the Steelers. Parcells could've done it if he didn't sell out on his team and create a huge distraction by negotiating with the Jets for their head coaching job DURING SB WEEK. Switzer would've done it had he taken another head coaching job.
So there.