The source, the Book of St. John’s Revelations (shortened to the Book of Revelations), you state is actually wrong.
FYI: there is no single verse in the Bible that makes the claim that one-third of Angels fall with Lucifer. Not a single one states this, not even in the Book of Revelations.
HOWEVER, Satan has been referred as a star that has been cast down or fell down to Earth. In Revelations 12:4 it states a third of the stars were cast down with him. The conclusion one gathers from this is that since Lucifer was referred to a star so too must other Angels and therefore one-third of the Angels were cast down or fell to Earth. Revelations does not go any further than this. Since this is left up to interpretation of the reader, it cannot be logically assumed that those stars are Angels because Jesus says in Luke 10:18 that Satan fell like lightning, not a star.But is Satan, Lucifer, a star? lightning? or an enormous dragon (Revelations 12:3-9)? And if like John witnessed the dragon swept one third of the stars and cast them down to Earth, was this by force or did those stars go willingly?
Are Angels, the sons of Gods, really demigods? If we look at Greek mythology, we see the results of a human and god mating as demigods. And if these are demigods would this not put the whole ideology of Abrahamic religions at risk? And now you know why they, man, chose to leave out certain books when creating the compendium we call the Bible. Better to be ambiguous than to risk the whole ideology of Abrahamic faiths (Judaism, Christianity and yes, Islime).
I don’t know what your contention is. Lucifer is a fallen angel. Check. There are many fallen angels. Check. Regardless of how Lucifer fell, like lightening or as a star, he fell. Does it matter? It’s metaphorical. For our benefit because we don’t understand metaphor so well, Jesus described him as the father of lies and a murderer from the beginning. I don’t see the need to debate it.