Nobody wants Higuain, obviously. He is old, expensive and useless. That means that we sacrificed Caldara and swapped him for Bonucci to get rid of Higuain, while we wouldn't have done it, if Chelsea, for example, had bought Higuain for 55m.
But that's not what some people here like @Seven are saying. They say that exchanging the nobody Caldara for Bonucci is a great deal on it's own and we don't even need a buyback clause because.. I don't know, I guess Caldara is useless.