The O-line of Brown, Strange, Andrews, Sow, and Onwenu will be pretty damned good, actually. They've been hurt, rotating pieces and trying to figure it out. I don't think the OL will be as big an issue next year (IF they re-sign Onwenu as their RT and replace or re-sign Brown appropriately).
I still think Strange is a tackle. Big guys bull-rushing is his biggest weakness. He's fast and strong but not anchored like a typical IOL. If Strange kicked out to LT and Mafi took over LG next year, I still think their OL would be good.
And yes, part of the OL problem is Mac Jones. He can't see a blitz coming to (literally?) save his life, one of his many weaknesses.