For the looks of Asuma It seems to me that Erza had a chance to to land one last attack right before or right after Azuma's attack. If she did then the next chapter could show Asuma fainting causing the spell over tenrou island to fade out. That would allow Freed, Gildarts and the rest to get back into the fight.
As for Gerard, just because he showed again in the last frame, doesn't mean at all that there's any chance of he coming out to fight for Erza. It is just a tease of the posibility that Erza died. The same way,I don't see Laxus coming to Tenrou Island.
What I think is gonna happen now is, before GH completely wipes out FT, they will be warned that the council plans on shoting ethereon over the island and retreat, and mest will risk his life teleporting all FT members out of it.