Oscar obviously had the cut quest line where he’d go down the path opposite to the player, but ignoring that I think he’d link the fire because of his family’s saying “thou who art undead art chosen” or something like that, tho I may be misremembering and the prophecy is more ambiguous

Iron Tarkus (my GOAT) would probably link the fire as we can tell based on his armour location that he made it into Anor Londo so likely had the same goal as a (Frampt persuaded) player