Oh, I get it. It isn't retaining Daws or Kaboul you're advocating: it's buying someone experienced like Vlaar. But that would effectively mean either sending both Veljkovic and Dier out on loan or selling Kaboul, Daws and Chiriches in order to create a new CB pool of Verts, Musacchio, Vlaar and one of Dier or Veljkovic: in the first instance, the thought of sending both our CB prospects (one newly signed) on loan is a bit of a disappointing one when looked at from a 'youth team to first team' angle, and in the second, that transfer activity would ultimately leave us with three new CBs + Verts, which would inevitably lead to an instability among our centre backs and early defensive difficulties regardless of Vlaar's ability to organize and hold together the back line. Also, that would mean giving up on Chiriches, and given his evident potential that's also something I'm not entirely sold on doing, to be honest.