It'd be this summer or never for me with Shawcross, as he'll be 29 next season. He's a proper defender and would be a great successor for Jags imo.
In some ways that's exactly what we need though as I say I'd bring two in an elder Williams or Dann and a young player with potential, though I think ultimately Galloway will play there, but needs the Stones treatment of time to develop there.
Younger centre halfs just aren't cutting the mustered these days with players at there peak there from 28-33.
I like Shawcross but he seems o be becoming increasingly injury prone.