User blog comment:IamJakuhoRaikoben/Chapter 503: The Last Sight Seen, Review./@comment-84.197.239.101-20160926192137/@comment-1776824-20160927192836

She didn't. Ever. She forced Seilah to summon Elfman by taking her over. Then gained to ability to use Macro by transforming into Seilah later. The opposite is not true, as well. You can't assume it is when it's never been shown. And the full conversation went as (paraphrased) follows.

Gajeel: Try to intimidate us all you want, but your magic ain't nothing special. The other members of the twelve got way more than you!. Bloodman: Because what I control is curse power!

That is a very blunt statement on account of both parties that Bloodman DOES use Magic Power. He never refuted Gajeel's statement. He just said, basically, that he has a low magic power because his Curse Power is his main casting mechanism. Except in the case of Devil Slayer Magic because it has, wait for it... MAGIC in the name. It's not a curse. Jeez.