User blog comment:B214/Chapter 499: Gray & Juvia/@comment-7418318-20160829105640/@comment-7418318-20160829110808

I mean eventually sometime down the road, rather than right away.

Those parts of herself that Juvia poured into Gray will surely stay there, so there's time for the whole conflict to end and someone getting the epiphany to ask Brandish for help after the hostilities are ended.