That is exactly what I have always thought happened, with one addition.
I think the game plan called for the infamous 4 safety base. We had used it against the Chiefs and similar teams. It was innovative but never too successful. The idea to be stronger vs the run than nickel base, and 2 TE sets.
So it’s pretty easy to see that Butler for reasons mentioned fell behind Rowe on the depth chart. That meant CB3 was going to have a very small role. I think bademosi played about a dozen snaps. So cb3 is essentially you aren’t playing today, and that let to the blowup.
I mean people can really think if they want that for no particular reason the greatest HC of all time, just decided in a Sb to not play his best players.
But a more logical scenario is he was, as he admitted, not mentally into the game plan and preparation, so he was demoted behind Rowe (not a big jump based upon how they had been playing) and freaked out. To think a 65 year old HC with over 40 years experienced would simply not realize a player could help is more likely than a kid messing up preparation then flipping out when told would take a lot of imagination or bias.