First thing this is some made up BS.
I have a source that is extremely plugged in. I sit down and talk to this source IN PERSON a couple times a week and he shares stuff he cannot talk about on air with me. In fact, we were sitting at a game together when Sark called and he had to duck out and take it. People in here that know me in person and know where I live will know who it is I am talking about. I have promised to not ever share what I know is going on behind the scenes in detail so I will just sum it up like this.
It's not that complicated. Arch is good but is behind Quinn on diagnosing the field and that's why he isn't starting. He is impatient, wants to take the big shot, and regularly misses the easy underneath throw for the guy in double coverage. Both these guys have holes in their game and Sark went with the guy he thought he had the best chance to win with. Sark is very good at talent evaluation and that's why we don't see wild misses with him. Everyone under Sark who wasn't starting showed exactly why they weren't starting when they got some playing time. And that's the full answer. Not wild conspiracy theories.