I don't believe Arch will make a "ton" of mistakes. He's been in Sark's system for almost two years, and based on the limited action we've seen so far, he's already learning from his mistakes. After being way too aggressive and loose with the ball vs. ULM, he played disciplined vs. Miss State the next week. The problem with Ewers is after 30+ starts in 3 years he will make horrible decisions that look like a RS freshman out there. I don't understand why people are scared of Arch making stupid plays when we see it at some point every week with Ewers. Most great QBs get better throughout their college careers. People are so bunkered in with Quinn love that they forget what QB progression is supposed to look like.
Will Arch be perfect? Of course not. But he will bring big play capability that will mitigate turnovers for the most part. We will see games next year where he throws for 300+, 4 TDs, and 2 INTs. And rightly, no one will bitch about it when we score 40-50 points and put up 500+ yards of total offense.