Also, I'm not sure we know what Muses do other than be passive and women (and I am never going to let that one slide, Hussie >_____>). Where's this bit about enabling others to use her powers coming from?
That's passive means, as far as we can tell. Active means you use your powers directly, or you act directly on that sphere. (We still don't know what Lord does, and we've seen no evidence of time traveling from Caliborn, so he may use or act on that power in a different way. But we know he's active, so we know it's going to be DIRECT). We know the Witch is an example of a class that is the next step to Lord, but I suspect that Lord might be an overloaded Prince. Rather than simply being able to use his power, he destroys it in some way or to some benefit for himself.
Passive shares your powers with others or uses those powers to cause others to act. The Seer, our prototypical strong passive class, has the ability to share knowledge of their aspect with others or to guide others through knowledge of their aspect. They serve as a conduit, if you will. The Muse would be a Seer dialed up to 11. The Muse of Space would thus enable others to gain knowledge of space and how to manipulate it. I don't think the "Muse" being able to grant her space powers, giving others the knowledge of and ability to manipulate space only insofar as it supports her ultimate "plan", is all that out there. And it certainly describes the mythological muse, doesn't it?