I wonder if the prison break will be after this arc or the next one.
I'd imagine the next since we generally seem to follow a pattern of>Casual school shenanigans>Oh shit villain stuff
Only thing that broke that pattern was when we went from the camping trip to rescue bakugou.
Still, it'll certainly be a game changing arc when it happens.
My money is still on Stain fatally wounding AfO as they break out, giving AfO the chance he wanted to give his quirk in full to Shiggy.
Then Shiggy will use AfO+Decay to kill Stain, gaining admiration from all the top villains in Tartarus so they join him while also possibly getting hate from the Stainfags, leading to a villain civil war.