Let me know if it's a problem then, aight man, holla then
This summarises the theme of the whole song; Kanye says once he gets his money, nobody is going to be able to say shit to him.
Also notably there is a pause after he raps:
Let me know if there’s a problem then
signifying his waiting for anyone to come forward with problems and that in fact no one does come forward tallking shit about Kanye falling off or losing his touch. His growling reaction
aight man, holla then
nicely leads into the confrontational hook.
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