Concern was his size. He’s not the mobile TE like Brant and there was even worry that he’d end up as an OL. Hes proven to be more capable as a pass catcher than I think they believed but would still be utilized in the rhino role most often if here.
It’s also fair to note what the room looked like two years ago. You put things together based on need and skill set. Was never a criticism of Carson, just a question of roster fit at the time and we know that changes each year.