Board Thread:Warhammer 40k General Discussion/@comment-37.152.33.225-20131111163502/@comment-6078851-20131215170758

lion el'jonson has to be the most likely to return 1st, because he's the only primarch who's location is known (to the audience - that's us) as well as being alive and well, albeit in stasis. whereas guilliman's location is one of the most widely known things in the imperium but alive and well he most certainly is not, and in my opinion he will (should) never recover from a poison specifically tailored to kill him.

as for vulkan, who's to say he hasn't spent the last 10,000 years observing/studying the imperium of man? surely in all that time he's garnered significant insight into normal humans, as well as how the administration has deteriorated from emps' plans. maybe he's even lived amongst some - i imagine humans could simply mistake him for a regular astartes - if he lived for a time on various worlds on the periphery of imperial space there would be less chance of his discovery. it could very well be that he fully intends to return and forcefully wrest control from the high lords. because he's spent so long studying the imperium, and while 10,000 years of study pales in comparison to emps' 50,000ish years of study, it would still give vulkan a far greater authority to lead, or orchestrate the leading of, the imperium.