Gransax's corpse still being in Leyndell, when we know that the Ancient Dragons attempted to destroy the Erdtree when Godwyn was still alive, and therefore at the beginning of the Golden Age of the Erdtree, makes me wonder just how incompetent both the Ancient Dragon Cult and Marika were with clean-up detail.
Like holy cow bury him or something. They just left him in the middle of the city, and didn't fix anything he destroyed.
Since the beginning of the Golden Age. You would think the people who worshiped the Ancient Dragons would have done something, or that Marika would get tired of the smell of dead dragon wafting up to her bedchambers.