Also I don't think signing Dann means he's a back up, I wish people would stop saying that.
Chelsea have Terry, Cahill, Zouma and Ivanovic
United have Jones, Smalling, Evans, Rojo
City have Demichellis, Kompany, Mangala
Arsenal have Chambers, Koscielny, Mertesacker and Gabriel
Even Liverpool have Skrtel, Sakho, Lovren, Toure and Illori
You play different players in different games, and there will be injuries, plus I doubt Dann would sign if he knew he was going to be behind Stones and Jagielka every game.
Yes eight million may seem expensive and yes he's 28 but would people rather spend nothing on another Alcaraz or wait around for another Stones to crop up?
If he signs I expect he will be successful and preferring VVD over him because he takes free kicks and is Dutch is a joke.