I have two questions about the cosmic scale lore of pathfinder

First, is Pharasma always the last survivor in the universe? I've read that she is the last entity remaining from a reality predating the current one and that she made the current one once the previous expired. Is she always the one to do it?

What gets me to think is actually Groteus. For one, there is the description of him being one to turn off the light once the universe ceases to exist, which sounds like what Pharasmas role may have been last time around. For two,he's described as being the moon and the moon often carries an archetypical representation of a cosmic egg. It gets me to think that true Groteus may be inside it and he'll emerge once Pharasma wraps everything up.

Second, how does the dark tapestry tie into the reset of existence. Descriptions imply to me that it exists outside of it, but then entities within it also exist within cosmic laws of reality, namely alignment. Is it known what does happen if a Mi go dies? Do they have a soul? I assume they don't get sent to the river of souls and then into the abyss. Do they melt back into th tapestry like how a demon would melt into the abyss upon death?