User blog comment:LordLuminous/Fairy Tail Chapter 411 Theories and Predictions/@comment-7418318-20141123173547/@comment-1359322-20141124044712

Actually if you read Sane's post in Raven's blog, i think you'll realize why CS or OS hasn't and probably won't be appearing.

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 * 1) Remember how Jellal was having his battle against OS while Erza was being tortured? How he crushed his own eyeballs to win? How 4 of the 5 remaining OS are down due to Grand Chariot + Sema? It's hardly been half a day since that fight. And the place where it took place is supposed to be quite far away from Magnolia. And Racer (using his Magic in a logicfail way >.>) and Jellal (Meteor) are in no condition to get any sort of help.
 * 2) Healing Magic is supposed to be extremely rare. We know only three healers till now. Unless Mashima wants to just bring out another Lost Magic user out of the blue ... wouldn't put it past him. :P
 * 3) The only way CrimeS + OS would be able to come here in any condition to battle instead of a bunch of bedraggled tramps would be if Grandeeney is revealed to be not inside Wendy and swoops in, dumps the lot of them somewhere, and flies up to help Igneel ... which I agree would be pretty epic. :D ... Or Mashima could just pull a BS move and bring them in and throw reason in the trash ... which isn't that unbelievable. >.>
 * 4) Yeah, hoping point 2 doesn't happen either. But I'm pretty sure Gray's saying 'future' was more of a nod to IT Chapter 5 rather than meaning anything else, but I'm also pretty sure you don't read it. XD