Stanley hasn't been himself as a pass blocker(albeit he hasn't been a liability either), and he's been improving week to week. However, whether because of Roman or not, his run blocking has improved and he was a pretty good one beforehand. Even if he's having a sophomore slump of sorts: I ain't worried. CJ Mosley went through the same thing and had a stellar season last year. He's had two consecutive "meh" games. But I'm not worried about Stanley. I'd still take him over several left tackles in the NFL and he's not a liability.
Not to mention Stanley is also coming off of an injury, and a lot of his game is predicated off of high football IQ , sound technical ability, and good feet. Ask anybody here: I loved the pick when we made it and for a good reason. He's one of the safest prospect I've ever scouted at the LT position. His floor is an above average NFL LT and he's proven to be better than that even with his recent struggles(and they're not really struggles). Not only do I have little doubt that he returns to form soon, but he'll be a top 5 LT in no time. He's needed to put on some muscle and he's done so. Even if it's incremental.
Stanley is a future all pro. Little doubt in my mind.