People have such a weird obsession with Mangala on this forum. He's not good enough for our system - if he didn't cost so much no one would care. He has his qualities, but they aren't right for this side.
Evans offers leadership, is very experienced and the ability to comfortably play on the left hand side in our system, something which Mangala can't.
A lot of people not reading this transfer right - we need someone who can step in and lead that back four in Kompany's absence. Stones, Otamendi and Mangala don't hold those qualities - Stones definitely can in the future, but he's still very young. Evans would be excellent for his development and at this stage, that's more important than sentimental value with Mangala.
Mangala was a failed transfer and people need to realise this.