I think you have already replaced Tevez. Kun was signed at a time when Tevez was expected to leave.
The Tevez situation is a joke. He says "I want to leave" so you sign a striker to replace him. He then doesnt leave and complains when said new signing plays instead of him! What did he expect to happen? Tell Aguero to sit on the bench till January when Tevez will want away again?
There isnt a player i have more hatred for than Carlos Tevez. I would rather United lined up with Fred West and Josef Fritzl (both deadly finishers to be fair) up front than have Tevez back.
Oh yeah in terms of a like for like Aguero was his replacement, I'm just referring to the 4th striker Mancini has said he wanted, as we play with 2 up front. However the whole 2 men for every position idea is only really justified when you're in 4 competitions. Without the CL even playing 2 strikers its pretty hard to justify a 4th of RVPs quality when we could fill it with Guidetti or similar.
The Tevez situation is clearly a farce. But at least its a farce everyone else recognises, and its not the club getting it with both barrels. Though I still don't believe everyone's intentions for calling for his head are always in the clubs best interests if you catch my drift.