Not all of his verses are as successful -- the first part "I'm fearless, now hear this, I'm earless, and I'm peerless, that means I'm eyeless, which means I'm tearless, which means my iris resides where my ears is ..." good concept, nice internal rhyme (eyeless/iris), but rhyming 'tearless' with 'ears is?' Ummm... and all those "which means" and "that means" are pretty awkward, too.
He gets better as he goes along, but he's being paid really well, he should maybe spend some more time editing. Maybe he'll grow up into a great MC eventually.