ok yall, i gotta theory of my own.
we all know bionicle g2 came soon after hf's ending, so why not throw a reasonable connection to that too? well, thats what i did.
at some point in time after the final battle between mata nui and makuta, the six toa nuva had a calling to go to a different planet where a darkness lurked--which that planet is where okoto is and the makuta on okoto is either a reincarnation of makuta or one of the brothers. they used an advanced space traveling technology to go there, but in turn of arriving there, they lost their memory. then the bionicle g2 story begins.
back on spherus magna, the matoran build a magnificent city, Makuhero city, along with many other modern settlements. the technology grew advanced and everything became advanced. but all the glatorians who had become toa when mata nui was a walking being became turaga, rulers of the different tribes. thus, there were no toa left. so, a agori/matoran named Akiyama Makuro created the hero factory, where toa like heroes were made to protect the inhabitants of spherus magna.
the villains we see in hero factory are just descendants of bone hunters and skrall.
as the population of spherus magna advanced in technology, the people changed in looks also, looking like how the civilians look in hf. and many many years passed and the turaga eventually passed away and mr. makuro was left, waiting for the return of the toa nuva.
and the mysterious villain in the endings of hf videos is just makuta in disguise.
after awhile, makuta returns in spirit form and does a bunch of stuff, which would be the story for a story im gonna write about hf's final story.
ok that was pretty sloppy but i managed to get it out there. what do yall think