If we're going with former UMB alliances looking for the fifth partner we find possibilities like Hydra (Banned or not) Blind Rage (Dead or not) and well i guess thats it besides idk, Dr. Cube. As far as enemies of Delirious' Army we could see Amasis (Quite unlikely but wow) Heiracon (Meh) Kizarny (Please No) Saturyne (Not her place on the card but shes been impressive) honestly I say secretly bring Del Rey in under a mask. Contract or not.
That being said its obvious itll be Hero.
Seriously though, in all likeliness it will be none of these and we will all be surprised and happy.