Yeah, I'd heard they were leaving the game because gg were releasing their subs before Gattai and it's pointless for a speedsub group to keep on releasing when they're being outsped by a normal group.
But even then, Gattai's translations made more sense than some of the bigger groups, they had the best encodes along with Aone&Menclave, so even if they're not doing their job as speedsubbers, I think they should just stay in the game as a regular sub group. The fact that they don't really bother with kareoke is nice too, as much as I enjoy nice looking kareoke, it's nice that they softsub it so you can get a HQ RAW with nothing in the way at any given time.
Or seeing as they have had some talks with gg abbout including their subs in the current release, they could even join for the rest of Macross Frontier, with Gattai doing the encoding and things would be pretty perfect. gg's kareoke isn't big and doesn't really get in the way like a lot of other groups, which is much more preferable to kareoke that takes up half of the screen.