We figured it was because Chris Brown sucks at
"He ain't sound bad," said Wayne, to Rolling Stone. "He's spitting. But come on, man! Do you know how many rappers would be like, 'I can't get on Tha Carter IV, but this nigga put Chris Brown on that bitch? Rapping?"
Good point! But Wayne, why not just G the track like the way Baby G’ed all the producers from Carter III?
"You can’t take a nigga’s song and take him off of it," continued Wayne. "That's like telling him, 'I think this shit is hotter without you.' I would feel played if a nigga did me that way."