21st Century Schizoid Man is all about two things: rebellion and anguish.
Kanye West doesn't rap about those things.

Simple enough.

Rappers DJ and EDM artist will sample anything under the sun


some of the big ones got like warehouses of music n samples or heck like 20 TB of samples on there Comp

Norg's a little incoherent but what he's saying is accurate.
A large part of hip-hop production is sampling. It's not exactly a rarity.

fair enough.

Kanye doesn't want to be on the radio anymore. Really anticipating what Yeezus is actually going to sound like.

Also;

Funny he says that but Rick Rubin is helping him tweak the album with some last minute changes.

Kanye's an unpredictable one. Rosenberg describes it as 'angry black punk'. We know Kanye's a perfectionist so I wouldn't look into some last minute mastering.

It was a bit more than just mastering but additional recording as well. Rick Rubin will most likely make a few of the tracks more radio friendly he has a knack for doing that.

you think they're seriously going to alter that much this late into the game?
It's due out next week.

It's not going to be drastic enough changes for a whole different sound but I'm pretty sure Rick helped make at the very least two tracks more radio-friendly than they were before.