Eternity Async Tutoring

Something I was wondering about:

What exactly is prime mover levels of greatness? It came up in Your Top Five Goals: A Productivity Method - #6 by LMD and it’s something that’s just kinda been in my head. I’m not looking for a super detailed answer but I was wondering how do people differentiate the different tiers of greatness of some accomplishments.

Is Ayn Rand someone at prime-mover level of greatness? Popper? I think Miss Rand may be, I think Popper is a step below, but idk. I’m just going off of Miss Rand having a whole philosophical system developed versus afaik Poppers biggest (though very important) contribution was primarily epistemological.

I guess I was more so wondering who are the prime-movers in history or, even more so, what level of accomplishment is considered prime-mover like?