I think Vuskovic is the real deal, and will become a top top centre back. HOWEVER, I also think that, in JPvH and Senesi we've got two centre backs who are ahead of him at the moment. Senesi looks pretty damn good – the type who lifts others around him – while JPvH looks to have attributes that our current manager wants and, importantly, has worked with him before.
If that was all, we could keep Vuskovic and, as 3rd choice CB, he'll get a healthy wodge of game time. However, we also have VdV and Romero, both of whom have shown that they can be much better defenders than than they have been for the last two seasons. The problem is that they have not done well as a pairing. It may be that JPvH-VdV or Senesi-Romero can become our new Toby and Jan instead.
Vuskovic plus a year's Prem experience (assuming he takes to it as well as he's taken to the Bundesliga) would be good enough to walk into our side. Right not, not quite. And the problem with loaning him to a PL side is that, well, we've just finished 17th twice so almost any other team would be a step up in theory.
RDZ has done the right thing in buying JPvH and Senesi, IMHO. Build from the back and, if good defenders are available, get them. They are less of a gamble than Vuskovic. If we're going to play two CBs, there just isn't room for him unless both VdV and Romero are off. If it's a back 3, well, that could work if just of our senior defenders packs his bags.
I've not even mentioned Danso, who's a player I've got a lot of time for. If he's happy to stick around as backup, I will be very happy indeed.