So. The echo of navigation: we know that it is a memory of oryx and want to go back to fundament right? We also know that it only remembers up to when he killed akka, as stated in part one. And in Grimoire 1: dark mirror, it says that Crota? was born AFTER the death of akka. So would the echo even know of Crota? And oryx only went to sol to avenge Crota, so does he even know why he’s there? It would explain why he want to go back to fundament, back to where he remembers. Sorry if I got this wrong.