It is said that Sirrus's mind was crushed at the end of Myst IV, since it had no spirit guide, but this is mistaken! We have been misled!
Reasoning:
Sirrus wasn't a traveller. He was dreaming (he was ejected there from Yeesha's body), and was actually in a state severed from a body. However, Sirrus put Yeesha into a memory globe (watch it from 6:55), and the chair was hooked up to make a transfer to that globe (so guess where he went after being ejected). Anyone who is in a globe is an 'ancestor', and it would seem that ancestors didn't have to possess spirit guides, since one can assume that the first ancestor (the little boy who died) didn't have one, and that only travellers needed to have one.
I pose;
That upon being ejected from Yeesha's body into the memory globe with her, he entangled himself in Yeesha's consciousness to prevent her from being able to travel back into her body (since being put into a memory globe before your time would be like forced dreaming anyway, and he would be trapped there because his body is connected to the body in the chair like the chair is connected to the memory globe; without Yeesha's body to complete the conduit, there is no go-between). So, after being disentangled and Yeesha went back into her body, wouldn't it make sense that he still be in the memory globe?
I say this, because according to the logic of this system, the memories/consciousness of a person always need to have a vessel, whether it be a recently deceased body, a living body, or a memory globe, otherwise they can't 'be' in dream, whether as a traveller or as an ancestor. If this weren't true, then why would the Serenians bother putting the memories of their dead into globes. So, if Sirrus wasn't in the memory globe with Yeesha, then he wouldn't have had a vessel, and he wouldn't have been in the dream to begin with. From this we can deduce that he HAD to have been in the memory globe.
Therefore;
My first conclusion is that a consciousness cannot be separated from its vessel unless done so physically using the fungus, or if that vessel is destroyed (dead body rots, or a memory globe is smashed). Therefore, since Sirrus had to have been in the memory globe with Yeesha (because no consciousness can enter dream without a vessel), and he had to have remained there after she went back into her body.
My second conclusion is that ancestors (people in globes) don't need spirit guides.
My third conclusion; Sirrus lives!
) appeared in one issue of Dark Horse Comics' 