I always thought Tyler Smith could make for a good tackle and we saw him there a lot in his rookie year where he had solid performances filling in for Tyron. I would think he's more equipped to handle the move now, but I do wonder about his ceiling. If he can be a top 10 LT in the league vs a top 5 guard I think it's a good move, but if he's just an average LT I rather keep him at guard.
For Guyton I like him too, he's just struggled with injuries and consistency. He played really well against Maxx Crosby with little help which makes me think he can develop into a good starter. He just has to keep himself healthy on the field, and get lower out of the snap to maintain better leverage more regularly.