I once had a scenario where if any loyalist Primarchs came back, one by one it would be Vulkan, followed by the Lion, followed by Guilliman, followed by a crusade to find the Khan (as they at least know he's somewhere in Comorragh so that kinda narrows the search down by 0.2%) which is then followed up with a crusade to find Russ and Corax. Dorn too but it's also kind of assumed he's dead so Russ and Corax would be more of a priority.



That's out the window unfortunately since Guilliman came back first, because "OOLTRUHMEHREENZ R DE BESTEST CHAPTUR EVAR" .-.



I'd just settle for Russ coming back is all, and hope none of the dead ones come back. If they DO bring any dead ones back, it should be either Ferrus or Curze. Ferrus because the very sight of him would cause Fulgrim to either freeze up or go into Angron levels of rage and cloud his judgement, which could throw the Emperor's Children off balance and possibly much easier to take on. With Curze it's cause at least he isn't super dead like Horus and it would mean a Primarch's connection to Chaos would be great insight into better understanding how to better combat Chaos.