Asap Rocky and Kendrick Lamar

Asap Rocky and Kendrick Lamar are to very different rappers. So I was surprised when Kendrick appeared in Asap Rocky's song "Problems along with Drake and 2 Chainz. I think that every song tells a story. But I feel if you put Kendrick's music together it become one big movie. While Asap's songs tell induvial stories. If I put Goldie,Problems,and 1 Train together I wouldn't really be able to say that they really all talk about his life and a autobiography about himself like Kendrick's music.