I would say that even tho Glowinski had a down year, we should leave him at right guard until someone beats him for the spot. According to PFF he was 1st in the league in penalties as a guard. That's definitely a spot to improve. He also allowed three sacks, tied for 20th. I do wonder if Smith would be a better guard than him.
Braden Smith to me is like Jack Conklin. Both were viewed as great guard but have done well at tackle despite their size. Both are 6"6'. Jack has 10 pounds on him according to google. I say leave him at RT til he shows he cant handle it or someone beats him for the spot.
AC has played LT in the nfl since 2011. For him to move to RT would be a mistake because all the muscle memory he has from the left side would have to be relearned. No need for that when he is thinking about retiring, even if its within the next couple years.
The best thing they can do for the line is start bringing in quality players that can either beat these three for their spots, or be quality depth for when the inevitable injury happens. We got lucky last year having a healthy oline. I highly doubt we get that lucky again.
The moving AC to RT was more of a joke. He has been trashed by fans for years when he was always one of our best players on the line. Dont fix what isnt broken.