User blog comment:IamJakuhoRaikoben/Chapter 428: If Our Paths are Different, Review./@comment-72.193.71.177-20150414033108/@comment-7418318-20150414061210

I think Wendy did have a role in this arc, though a role that's already fulfilled.

Her role in my opinion was to show Natsu that not all former FT members will just jump at the chance to reform the guild and thus he became a bit more prepared for possible rejections in the future. And of course they couldn't just leave Juvia in that state by herself without seeming like total assholes too.