Tepper does not dictate who the teams qb will be, he never did. Fitterer sold him on Young in 2022. Everyone in the building went along with it as Fitterer was supposed to know what he was doing. He's no longer he because he didn't. Dan is getting the same leeway until he proves he doesn't.
There's no conspiracy to keep Young the qb here. The only thing that's going on is the are making sure they do not kick Young to the curb too soon like they did with Darnold and Mayfield.