what are we talking about ?
it does not matter how it evolves,
if it is Vulkan and he is dead now, that would be the most crap way of terminating a primarch so far, a true and utter dissapointment,
if he can respawn from a skeletal husk, that would also be utter crap,
in betrayer e.g. Lorgar was nearly killed by plasma burns, I mean that is a long way from being burned to the bare bone.
if Vulkan would be granted the gift of regeneration of whatever in line with the reptilian association of the salamanders that would also be rather lame.
I m curious to see how they are going to write themselves out of this, the only option I see is that the skelet moves to eternia where together with the respawned sanguinus the foundation is placed for he-man and skeletor,
serious, for me this could be a real show stopper in terms of reading 40 (30) K books