I'm also thinking that because serpents are imperfect dragons they wouldn't be immortal. So maybe they died and either had some weird kids with God knows what or did things that carried their legacy. That legacy turned to legend over the many many years. Thus you get 2 different interpretations of what the serpents looked like. Im thinking Frampt is the statue at the archives.It just makes sense, he was pushing the whole succeeding Gwyn a lot and even calls you a lord once you have filled up the soul vessel. It's not a far strech to say that he started the whole Lord of Cinder thing. I'm sure the Lothric royal family would honor the one who founded that. Whether he was alive or not when the royal family started the tradition of making the perfect lord of cinder. In fact it makes more sense that he's dead and all they have to go off of is what the scholars discovered about him. At first Scholars were worshiping him too and made the statues in the early times of the archives. Maybe their findings on him over time eventually showed he was being deceptive and that's what made the scholars question the linking of the fire.(their still maybe involvement from Aldia) I feel like the bodies more reflect the different beliefs of the region where they're made. I'm fairly certain Frampt is the statue in the archives, it makes sense that they would depict his as priest/angle like. (before angels were herecy) But I'm not sure what body is the Ringed city statue. I don't think it's Kaathe though, he probably ended up where Londor would eventually be. It's one of the others who bow to us at the dark ending in the first game. I'm not too far away from going through there again so I'm gonna take a better look at it and try to figure out what the hecks is the lower half.