Board Thread:Warhammer 40k General Discussion/@comment-25149066-20140730083800/@comment-6078851-20140817153205

we do know that either - we the audience, as the denizens of 40k know nothing about el'jonson, and while guilliman is technically alive he is also a second away from death and people only believe that he's healing, but belief doesn't make it fact.

we don't know if any of the others primarchs are still alive. it's equally possible that corvus, khan, vulkan and russ are dead or alive: simply put know one (40k denizens and we the audience) knows anything about their current condition.

the only primarch that's alive and completely healthy is the lion (albeit asleep), and the only 40k inhabitant that's aware of that is emps.