User blog comment:FairyRaven/Fairy Tail Chapter 448: Fight the Power! Review and Commentary/@comment-24264679-20150817160616/@comment-24264679-20150820184033

Like is said Hiro isn't going to so other guilds helping out Fairy Tail in the relevant battles especially if it is continent vs continent like you people claim it will be because every guild would have to protect their own city. Thus it will be still be Fairy Tail vs the relevant members of the Alvarez continent. We only care about the Spriggan 12 and Zeref not the lesser members thus Zeref wants LH which is in FT in 2hich he will send his strongest members to retrieve it. His strongest members would be the Spriggan 12. Thus it will be FT vs Spriggan 12.

With that being said Hiro isn't going to interrupt a great fight with the Spriggan 12 to see other guilds fight fodder. We might get a few panels but nothing great enough to actually factor real importance in.

A full fledge war wouldn't allow any tag team battles especially if the other continent have more players. If their isn't a full fledge war then other guilds aren't needed. So anyway you put it the other guilds relevance is super small in the overall picture of the arc which is the Spriggan vs FT.