I agree with Klatt, with a caveat. I think Sark knew how things were going to go. But I don't think he wastes learning opportunities, and I think pulling Ewers gave him a chance to let Ewers reset but to also show Arch (and the fanbase) that Arch wasn't ready for prime time. That Arch isn't some savior. He's literally saying "let me show you why you're not starting. You don't want this smoke week in and week out." I'm sure he has it in the back of his mind that Arch's legs or deep ball might turn the tide, but that was unlikely and would have been a pretty nice problem to have were it true.
If you remember the spring game a couple of years ago, Sark did the same thing - he put a freshman Manning in against our ones on defense. The deck was stacked against him and Manning struggled, understandably. But it also showed everyone that Arch wasn't going to come in and take the job from Ewers. With Ewers, Murphy, and Manning on the roster, that room could have fallen apart in 2023, but it didn't. I will admit there were times that I wish Sark would pull Ewers - most notably the Kentucky game. But I'm capable of cooling off and letting it go. I might second guess my betters, but you have to be able to move on when they show you they're right.
Much of this is speculation on my part and I will fully admit that i wear burnt orange glasses. But the guy knows how to manage that room. Scottish timepiece or whatever his name is definitely doesn't.