User blog comment:Omega natsu2/Chapter 385: Spirit King vs. Demon King, Predictions./@comment-5233713-20140523050814/@comment-5233713-20140523083443

In Bleach, the fillers were often incoherent, in Fairy Tail it never contredicts, it doesn't recall every single things that happened for sure otherwise it wouldn't be a "filler" (arc added to the original story), but when referring to Zentopia event, they're talking about events involving Lucy that occured between FT's core members return and the GMG, which means it's coherent. Weither or not it was first mentioned in the manga, doesn't make it any less coherent.

Plus Oracion Seis's x791 design remain the same as it was in the filler, Fairy Hills which first appeared in a omake, was then mentionned in the original manga, that's the consistency I am reffering to. And I don't think Cobra ever changed, he was always shown to be mean, but to care a lot about Cuberos, everything that happened after the Council members were killed had nothing to do with KotSS so there was no point into mentioning anything of it.