Brown will get better, every rookie has ups and downs. Most rookies don't change positions twice within the first 8 games of thier career. I'm betting he goes back to being himself next week. He has looked like our best lineman and has been rated as the best rookie gaurd.
Yeah I'm not worried about Brown either. He's got good strength, mobility, toughness, and he works to improve. Just has to keep working the technique it will come for him. To date he's been up and down but that is to be expected with rooks as you pointed out.
The key for this OL in my estimation is that Brown was moved to the left side to allow for the vet presence (Saffold at that time) to settle down HStein. Who, incidentally, has played above average for a rook with solid play game to game. GRob, meanwhile, was the one who struggled. Now that they have flipped things with the current vet presence (Reynolds) to the left side, I do expect the two rookies to have their ups and downs. Which means the key to this line is the LT position. Will GRob settle down with Reynolds next to him?
Matchup-wise the 9ers are nothing special up front, so I would hope the OL has a good day this next Sunday as a tune-up to that game in Minnesota. That is where they're gonna have their work cut out for them, where an aggressive and well coached front will test their ability to play together along with a hostile environment.