The FA class at DT and other positions is bare. There will be many more trades the offseason compared to others.
A great GM would listen to all offers and be making calls himself.
At 3T, we are stuck with Grady Jarrett. We drafted Sherman Turner last year who can play there. At pick 25 there are a few 3T and 1T we could take. So if they get the right value, why not? Dexter hasn't become a blue chip yet, maybe he does and maybe not.