Then you need to wobble your own head for asking such a pointless question. No two players can be the same, defenders mature and I doubt we want another player of Kompany's age. I'll stick to my answer, thanks.
My question was perfectly valid. People are saying "replace Kompany he's too injury prone" in such an offhand way like it's the easiest thing in the world to do. Without Kompany's guidance and leadership our entire defence collapses. You can't replace him with an inexperienced 21 year old and expect that to solve the problem. Either Kompany gets over his injury problems or Otamendi or Mangala need to develop some sort of leadership ability.