I think everything is an open competition on this team. I wouldn't be surprised with anything. If Mitchell makes it to campus, he'll be in the competition too.
Regarding high school ranks, neither Carson, nor Jarren were primo prospects, but Carson was ranked significantly higher (SS68 vs SS122).
Carson Kerce Class of 2023 Perfect Game Player Profile
www.perfectgame.org
Jarren Advincula Class of 2023 Perfect Game Player Profile
www.perfectgame.org
I don't have a Perfect Game Premium account, so I can't see Mitchell's (only past classes are free), but I'm pretty sure he's a top 100 player overall, so probably a top 20 or so SS at worst. He'd probably have to really show out to win the job though.
Ryan Mitchell Class of 2025 Perfect Game Player Profile
www.perfectgame.org
I fully expect to see Carson at SS and Jarren at 2B, but again nothing would surprise me.