From my understanding, does XC still need a number of masternodes (or supernodes or simply nodes or whatever you call them) to perform mixing ?

If the answer is yes, the coin will be less decentralized as long as amount of nodes smaller than amount of clients/users, is it true ?

An who will operate these nodes ? what is the benefit for operating one ?

Is there any potential leakage of user's anonymity in case one entity own a sizeable amount of nodes ?