Funnily enough if you ask us Tigs supporters, they would say the backline is the least of our worries. They mostlty look shaky at times due tot he midfield and to a lesser extent HF lines lack of pressure
Balta has proven to be a very good KPD
Young - despite being new to football showed 1v1 he's actually one of the best stoppers of the 23 season, he should get better
Grimes, agree, it was sad, could bounce back but if not Gibcus should slot in, the other to watch is Bauer.
Rioli, Short, Vlas all elite
Brown is the youngster that is very exciting for us, great size, arguably best kick in the club and should be ready to go
Depth as you mention the obvious issue
Sonsie and Dow will play plenty of football and completely change our midfield dynamic.
The main luxury we have had in our backline that isn't obviously replaced by what exists on the list currently is the 2 problem solvers Grimes and Broad. Highly disciplined defensive minded runners with size and speed, they have been used to play on the most dangerous looking running or speedy forwards. Grimes looks past his best and Broad will be 31 early in the coming season.
You don't have to replace every player precisely to rebuild a great backline, but these guys have been a ready solution to some tricky opponents to match up on.