User blog comment:Miskos3/Fairy Tail Episode 240: Tartaros arc: Where Prayers Go, Review/@comment-24102956-20150704081705/@comment-7418318-20150704083314

It's quite possible to make good openings without spoilers.

You can see them in many anime and even some of the FT openings were like that. The one for the Tower of Heaven for example.

Wendy's DS was quite a big surprise in the manga, so putting that into the opening was quite a massive spoiler that could have been avoided very easily.