User blog comment:IamJakuhoRaikoben/Chapter 332: Fire Bird, Review./@comment-4489126-20130524160016/@comment-7418318-20130524161056

Probably because Storm can manipulate weather and thus summon up wind and lightning both (along with mist and rain... not sure about snow).

But with her healing and support magic Wendy would be far more kickass than Storm!

While it would be cool to have Sky and Lightning combined, the situations of how it came to be wouldn't be so great.

1) Laxus is giving Wendy his magic -> repeat of what happened on the Grimoire Heart airship.

2) Wendy, being sure that she's useless in a fight, gives Laxus her magic -> that would suck.