He's not Micah Richards, but he's not Williamson, hence he'll easily keep the level of say Kompany. Being a central defender is not necessarily all about speed, just look at Vidic.
It looks to me that you prefer Williamson over Verthongen, just because of the type of player? I mean, seriously, Williamson must be one of the slowest defenders in the league. How many times hasn't he been ran away from?
It's not just pure black and white imo. But everyone should have their own opinions, but I think your POV is way off.
Eh? How on earth did you come to the conclusion he'd prefer Williamson?