The contrast between Earl’s flow and Jasper’s is like a pair of lips in that lips are usually two shades- dark on top and light on the bottom. Not to mention the fact that Earl is famous for his big lips
A paralipsis is an idea emphasized by being glossed over. Earl does not need to harp on the fact that he is better in contrast to the competition.
Earl’s fat ass lips also set him apart from other rappers.
This isn’t the first time OF has mentioned the line from Nas’s Street Dreams. Even though the song is off of Nas' album It was Written, not Illmatic, they are talking about the way he rolled circa 1994, which is when Illmatic came out.