Ignore Carlson's low rating. His position ranking (5th overall) is signal that he has enough leg. If a guy has enough leg, he can refine technique and improve (with BC's coaching and private special teams coaching). Carlson also kicks too. Maybe we will luck out and he'll be an asset in both.
BC has recruited plenty of good kickers and punters over the years. When they struggle it is rarely about the leg and all about the head. We won't know if Carlson can hack it at this level until he takes the field. Good luck to him and welcome aboard.