I'm completely torn here. For years I've compared Kubiak and Garrett because they really sucked and had a similar trajectory. Kubiak was the winner due to his past experience and two playoff wins but if you ask any Texans fan or someone living in Houston...which I was at the time..and they'll tell you how the guy lost more games by his decisions....bad play calling, lack of clock understanding, being ultra conservative, letter jackets for playoff games..just outclassed in big games. That was Kubiak. And he had a team quit on him. If you read the recent news, they say he had a Come to Jesus moment post heart issues and while coaching under Harbaugh in Baltimore. Loosened up a but, was less stressed, etc. The reality of a lot of it though is that the guy inherited a ton of talent. Wade helped on D a lot. He always has his first 2-3 years with a team.(see Texans drop his last years there). But honestly Wade did the job with immense talent that Fox had. Kubiak's DNA was there for all to see in the playoff run. In the Super Bowl it was 3rd and 11 inside the Panther 20 and they threw a 5 yard out. They were trying to let the D win. Kubiak was just as conservative.
As far as Garrett and continuity....it won't help IMO. I watched the SB with one of my best friends that has coached in college and pros. He played at Stanford and played and coached under Bill Walsh. He coached under Neuheisel at Washington when they won the Rose Bowl. He coached under Jack Del Rio in Jacksonville. He's been around some great minds at other stops. He told me that from what he knows and he hears of Garrett, the guy is not a good coach. Said that its nepotism around that team. His words were "Garrett is what a guy should should sound and look like as a coach but he can't coach. Jerry likes that he feels like a good coach." Coaching changes happen yearly and in many cases it doesn't take 2-3 years to change things and get going. Players in the league have been in many systems, they know how to play. Players buy in or they don't.