True. But maybe Rogal left for a secret mission or is currently advancing Terra's defences in secret to make sure no one can leak out what is being done. Either way, Vulkan saw Dorn and that's the best clue we have, maybe both of them are creating something amazing.

As for Leman and Magnus, I got the idea that Leman would absorb good side of Magnus, contain it in his eye, rip it out and shove into Magnus's skull. That would be the most Leman thing to do and would probably catch even Chaos Gods of guard. He could also come back with Raven by his side like Odin (Corax) and Valdor.

As for Isha, she is still waiting for her prince to rescue her, or rather a wolf king with his company of too op pls nerf companions. Actually now that I think about it, Leman would create a rescue plan, Corvus would become invisible and sneak into Nurgle's garden (And maybe he can make others invisible too) and Valdor would keep an eye on them. Perfect team for greatest 40k prison break plan.