The spider fang says that tseldora's form changed to something far from human. one aspect could be that he fused his soul with the spider and that's why it has two heads. the spider fang's description should not be ignored or brushed aside. (i also said that you find other tseldora robe wearing people in NG+)
Haven't "written" any fanfiction, I'm just piecing items together, rather than disreguarding half of them to squeeze old characters into the game.
...are you serious? The bug in DS1 is the witch of izalith. what are you debating here?
The prison wasn't built to contain her, she contains herself within the prison, to punish herself for her sins. You say the bug isn't the sinner, but who do you think the bug is? It can't be the witch of izalith, because she's just a soul. that's a physical body. (What are you talking about with "all of izalith's pyromancers"? You know that those are specificlaly the seven witches from the opening, right? All of them are accounted for in the game)
Yes but there's more to the description than the single word. Eons have reduced it to remnants, which means that over time it became nothing more than that soul. none of the souls therefor would have their physical bodies by this point in time.
there's one and one and a third one to put together. there are things that lurk below and a one whose name must not be repeated. why would a soul remnant have things that are in its service? You can't ignore some items to make a theory work, you have to take all of them together. Gwyn's soul was likely in his possession before he was taken, and is how his soul became a greatsoul in Life, since there are items that say he had a great soul during his rule.
With this "DS1 bosses in DS2 lol" stuff, people reached a conclusion first, before attaining a full picture of the theory. When there's text that discredits it, their first response is to disregard inconvenient information as "lazy writing", rather than questioning their own theory for contradicting parts of the game. It's like when people thought Solaire was gwyn's firstborn because "it clearly implies that" even though it was never stated, and that fancanon eventually died out. Jumping from A to D by way of F, instead of finding a B and C is what happened with that shit. The DS1 bosses being the DS2 bosses has contradictions, which means it's likely not the case.
You're just being an asshole.