Well, to be fair, it's supposedly an Anti-FT team, with only 5 wizards, and there are 10 FT wizards in the competition.
If you're type picking specific wizards to counter specific members of FT, then you still end up with 5 wizards you haven't accounted for.
It's possible that Raven Tails team was selected to counter Fairy Tail A, and he had no idea that Fairy Tail B was even going to be in the tournament(since Fairy Tail A didn't even know).
Well, has she ever actually fought another wizard that also uses wind attacks before?
I mean, Natsu does it all the time, but that's because he constantly ends up fighting other fire wizards for some reason.
Aside from that one guy from early in the series that's from before Wendy was even in the series, I don't remember there being another Wind wizard.