There are a limited number of people in the entire world who can play OT in the NFL (maybe around 60) and you want to move one of them to guard where there are maybe 5x as many who could play that. It mathematically doesn't make sense to me.
There are multiple film study professionals who thought Fuaga would be moved inside once drafted. I saw one that said his NFL comp as a guard was Jermon Bushrod. It's not that "out there" of an idea, but I can understand your trepidation.