Can't honestly say I've got really good instincts on FT, so I don't wanna push a POV where I'm totally missing it. Anyhow I have been enjoying FT quite a bit lately, and it'll be interesting to see how Mashima takes the story, and how he ultimately portrays Sabertooth.
One thing is certain, the real villain in this arc is probably not related to Sabertooth. Ultimately the Guilds might have to work together to defeat the evil that is lurking in the background. This might mean greater closeness between FT and ST in the future.