A great QB may do about as well with an average OL as a very good one, perhaps an elite OL makes him even better, slightly? I'm not sure, no way to test, but we've all watched elite QBs with otherwise mundane OLs be elite. It also helps to have a great RB tandem with said elite OL, there you can't do much unless you are Barry.
And of course elite WRs can pull bacon from fire. And TEs. Maybe it's a team sport ...
We just saw a pretty unheralded QB win the NC and I didn't think the OL was elite at all, better than mediocre, but not elite.
It would be interesting to see Joe Burrow with a mediocre OL, he had one of the greatest years I've ever seen. Did LSU have a great OL? Does Cincinnati?