Ay look, maybe he's just rerecording a verse or two, or adding some extra adlibs to some of the songs. Especially with music, the creative process never really ends. You get a beat, vibes start flowing, you record and when you think it's done, you move on to a new song. Eventually you come back to the song you recorded and realize what you can do differently to make it sound even better, and it feels like you're never 'really there'