His arms are 18 inches without even training for 4 years, didn't you claim 18 inches? you have 5 inches of fat on yours.
He has had 24 inch arms, contest shape, that's bigger than your leg.
Oh brother, leave it to "salt shaker" to give the greatest bodybuilder of all time training advice. 
Come on, bro. do you honestly think that he hadn't trained biceps in 4 years in that clip? I know you are a Levrone fan, and so am I for that matter, but you honestly can't be that naive.
On a side note, Kevin's triceps look insane even without him flexing.