in his book (which I know gets clowned on for being a lil over the top with the bullshyt) he addresses that shytProdigy's fall off is one of the greatest fall offs in skill in hip hop history to me. I never witnessed a MC on the level that he was at deteriorate in skill like that. Ever. He should be saluted tho for still putting out quality music.
basically drugs and alcohol
his sickle cell
dude just lost his groove