I didn't coach college. I played OL in college, coached HS and prep school.
You do make a good point. And it is worth noting that Glenn made a bad hire for last year at QB coach.
I don't know why I thought you were coaching college but you got my point. HCs have no significant 1 on 1 time with players.
I agree London was a bad hire, terrible in fact.
I prefer position coaches who have played the position.
I personally would reach out to guys like Rivers, Luck, McCown, Pennington. Ryan. It would be great to get a guy like that to mentor and develop a young QB most have probably made too much money to be interested or would expect to be immediately hired as OC if not HC