They might still switch it up but I think Campion is the real "one." Marcus and Paul too extreme, Campion seems to be trusting his own gut and reason. He's balanced even at such a young age. Through all that he always manages to do the right thing as well. Sounds like he was the one holding everybody down when Mother and Father were gone. The snake also already sense some kind of connection with him as well, if it really is the "sword" I could see him being the one to master it.
I don't expect the show to go the obvious prophecy fulfilled/chosen one route though.
I don't expect the show to go the obvious prophecy fulfilled/chosen one route though.