Zimmerman might hang around because he’s reliable and not a bad injury replacement, but he’s not going to start much this cycle.
Ideally Cameron Carter Vickers and Chris Richards would be the CB pairing. CCV starts for Celtic and is a regular starter. Chris Richards is at Palace. He hasn’t played much due to injury although he is healthy now, just not getting minutes.
Turner will probably stay with Arsenal next season. He will get minutes with champions league and FA Cup games. Arsenal got bounced from their tournaments early this year which really hurt Turners minutes. He probably won’t ever pass Ramsdale, so he will likely leave or go on loan for 25/26 prior to the World Cup to get minutes, but he’s fine where he is another year. The guy to keep an eye on is Gabriel Slonina. He’s only 19, but Chelsea bought him from Chicago last year.