Bu says artist features get left off albums all the time, and it was nothing personal against Chris. However, Bu didn't indicate that Kanye's settled anything with Soulja Boy, who was also pissed about being dropped from the album ... even challenging Kanye to a fight.

As we reported, Kanye and Drake have recently been at each other's throats, with Drake calling Kanye "burnt out" and Kanye posting the address to Drake's home in Toronto. Drake's set to drop his highly-anticipated "Certified Lover Boy" album Friday.