I dunno at 27 he's not got long to stop making errors, he'll be 30 before we know it and that'll be that. A player at 27 should be nearing the peak of their powers and that's a worry. You can't blame a manager or other players when you make basic errors as he does.
We should try and sign Hummels from Dortmund, he's young quality and would be the first step to rebuilding the defence.