Originally Posted by Leviathon

It seems very likely that Draenor did or does have a Old God(s) if what the Arrakoa were summoning was one. Considering it has elemental lords and whatnot it seems very likely Draenor was very similar to Azeroth.

I think the Curse of Flesh is more a result of only Yogg-Saron and not the other Old Gods acting with him. Just seems more likely that the Old Gods are acting on their own and doing there own things to try to affect Azeroth based on where they were imprisoned. It just happens to be that Yogg-Saron was imprisoned near where the Titans were constructing the Vrykul, Dwarves and etc. and was able to affect them and manipulate Loken into madness.

Maybe each of the Old Gods just attached themselves to a part of Azeroth that made it so that if they were destroyed it would cause larger problems and so destroying Yogg Saron would of killed those affected or descended from those affected by the Curse. Maybe the Emerald Dream would of been destroyed if they killed the one affecting the Emerald Dream for example also.