Merovingian

well i think that he is holding the keymaker because the architect needs the keymaker for his designs, but since i think that merovingian is a program that has been replaced he holds a grudge against the architect.

That is what he is "programmed" to appear to do. All is for the benefit of Neo's development. He had to chase down the Keymaker which would lead him to the Architect. Of course, Neo doesn't know this fact. He doesn't even know of the Architect at this point. All was designed to steer him in that direction. He had to find to door to his further development. The Architect is the last important hurdle.

It is a trinity in itself... The Oracle led him to Merovingian who has the keymaker, and that encounter led Neo to the Architect.

Yes its like a game u has to get throught many steps before get the target.

But in the movie M Rev. Neo has to relize that he and only him can take control os his situations and zions too

It's not really a game at all. It's a test and proving ground. In the end, he is the person to bring about the new world.