Here's what I think happened:
1. Lewis came in from outside Coach Prime's immediate network, but the stars aligned for a year. Lew was looking to get out of a dead end situation at Kent State and needed a path to a job where resources matched up with high expectations. Prime knew he'd have to build from the outside in year one and was looking for an offense that could overcome being the less physical team & score a lot of points. It was a good fit on paper.
2. Coach Lew lost autonomy when Shurmur was brought in as an offensive analyst who had Coach Prime's ear. Almost a consigliere situation. Shedeur wasn't comfortable with all the zone read and rpo that form the base of the offense. He also didn't like playing at a frenetic pace instead of taking time to survey things presnap & it wasn't how he'd be used in the NFL. It was like having Tom Brady as your QB but an offensive system designed for Tua. Shurmur backed up Shedeur's frustrations. Likely, Kennedy was also frustrated because the Lewis offense makes his job harder and isn't a style that has ever been able to win championships at the highest levels.
3. So every week, even when things were going well early in the season, the offense got farther from what Coach Lew does and it resulted in the weaknesses being exposed without the advantages being realized. Made worse since Travis wasn't available for a few weeks and then wasn't himself, which removed the "when all else fails, just throw it up to Travis and it will work out" option which covers a ton of flaws.
4. Meanwhile, the OL was not performing. And it couldn't be blamed just on personnel or scheme because there were a ton of missed assignments. They tried different rotations. They tried slowing down to let them get on the same page presnap. Nothing worked to improve it. Shedeur was getting killed like no QB in the nation and the running game had been schematically limited without zone reads & rpo to only the short yardage packages (which did perform all year when you look at red zone & short yardage run success stats). Since BOB was Coach Lew's guy, this ultimately fell on him.
5. Coach Prime knew at least by mid season that this was not going to be his offense next year and Coach Lew knew by at least the same time that CU was not a situation that suited him & he needed to find his next opportunity. It was a bad fit, it was broken, everyone in the building knew it, and they did their best to get through it while all parties had one eye toward 2024.
Anyway, I don't blame anyone or have any negative feelings toward how anyone handled things. I think it was simply a matter of how sometimes things can look great on paper, the people all involved can be damn good at what they do, but the pieces don't fit together when you combine it all. The whole ended up being much less than the sum of its parts when you consider how accomplished the coaches are as individuals and how great the talent was at QB and other offensive weapons.
I expect that Coach Prime has learned a ton about what he needs in an offense, will get what he envisions, and the offense will be great in 2024. I expect that Coach Lew will win at SDSU and have one of the highest powered offenses in CFB. It just didn't mesh.