User blog comment:FairyRaven/Fairy Tail Chapter 391: Gray vs. Silver, Review and Commentary/@comment-24277053-20140704112330/@comment-24546844-20140704140119

Even without Makarov alerting the other guilds it's still possible that the other guilds already know that FT is in trouble. I mean, their guild building was destroyed, then their city, and if we consider more hints, Yajima's restaurant and the city it was in, the whole magic council and other cities where the magic councilors used to live were atacked too. That is more than enough hints that something is going on and of course the light guilds would try to contact each other for information. And if not, Doranbolt could take a more proactive approach and just alert them as it wouldn't take really long for him to do it. To me the only problem keeping them from showing up is that they stil haven't had the time as they're from other cities and it could take some hours for them to arrive, but I'm sure that they are already in their way.