Also it's his talent as a caster and a personality which gives him reason to be next to dApollo while casting.

Tasteless isn't the most knowledgeable caster for SC2, which is why Artosis is there, Artosis is the brains, Tasteless is the funny, and is there to calm down Artosis when he goes full retard; you don't necessarily have to have 5 years as a pro-gamer to be a good caster.