No one knows who did what. If you read the credits, there's almost 10 producers on each song. 2-4 people get producer credits on each song almost and then you have lists of who did what instruments. It's also been knows since his second album that he has a lot of writers with him. Not really much to dispute here.
So what though? This is common practice for many albums including some of the greatest albums produced of all time. It's a Kanye West album, and since the MBDTF sessions, we know that this is how his albums are being produced. I can't be mad at that just cause it's not how hip-hop albums are traditionally produced.