User blog comment:FairyRaven/Fairy Tail Chapter 391: Gray vs. Silver, Review and Commentary/@comment-31.132.65.50-20140704183810

Ultear involvement is the most resonable option IMO. The others I read below seem to be pointless or not thought through.

Gray done his best and his magic was shown to be ineffective. What difference would adding Lyon make? The same with Juvia. Deliora frozen Natsu who is a fire dragonslayer, Juvia is one-shotable for someone like him. Using Ice Shell would be even worse: 1) It would undermine all Gray character developement, 2) Ur used Ice Shell against Deliora and the monster returned to life, using it again and expecting a different result would be dumb, especially since the thing was modified and can now resist ice. And story seem to be hinting Ultear part in Gray victory.

Then again always when I hoped for Ultear involvement I ended disapointed. But maybe Hiro will make a fan happy for once.