why would anyone be surprised? Raven is known for having very strict recruitment guidelines. she didn't accept Blob into her Brotherhood until he proved that he could use his powers to escape prison. and she led the freedom force squad that successfully defeated and imprisoned the Avengers. they escaped only with the aid of Spider-woman; whom Raven did not recruit. Pyro and Avalanche were completely loyal to her; yet, not total incompetents.
Quality over quantity, I'm personally rooting for mystique. With Scott at a very close second