Unpopular opinion here, but as I rewatch the game Guyton wasn't very good. I only count about 10 or so snaps where he went against Garrett, I'm seeing #99 and some #74 on Guyton a lot more often. Garrett on his 1V1 just blew by him pretty consistently, which isnt uncommon for a lot of LTs in the game. He does a really nice job typically of keeping his shoulders square and when he gets hands on a defender its game over. It shows you the ceiling the guy has. I'm seeing some weaknesses on film that were covered up with excellent play calls and a game getting out of hand that didnt require a lot of longer developing plays. He got driven back into Dak pretty often with a straight bull rush, and seems beatable with speed to the outside. He also has a tendency to bend at his waste on occasion instead of dropping his hips.
He has every physical trait to be an all pro LT eventually, but I see some mistakes that need fixed and will likely turn into growing pains all season long.