I don't think Veltman and Dunk are very comparable.
Not much between them quality wise, Dunk has more physical presence, but Veltman has a smarter brain, both play different roles and slightly different positions.
FOr Dunk to return to the centre of defence means resting Burn or Webster in a back 4, not sure he displaces either at the moment.
Aback three is a different thing, have all three with DUnk in the centre
Yes, it's a bit of a poser for GP, isn't it. Some people will come out with that old chestnut, 'oh yes, that's a good problem to have'..
They aren't the ones who have to try and solve it!