I wish he had talked about the rewards for doing all of this too. So far I've read that you only earn an Eye when the cursed enter your world and you kill them. If they die in their cursed world, then you get half of their souls. I see that repeated so much, I wonder if it comes from one of the guides.
This never made much sense, especially when it was recommended to hide your gravelord sign to keep them from invading you. If you only get Eyes from killing invaders, then you'd want it somewhere obvious, no? Some of these covenants feel like they weren't fully implemented in the game, but the ones that do have ranks are mostly focused towards acquiring the items that rank you up. I've seen one person claim that deaths of cursed players in their worlds would give you an Eye, but no confirmation on that.
A moving soul sign sounds cool, in that it might increase the chance of the sign being noticed, and avoid situations where the gravelord finds an impossible spot to drop the sign. But that picture looks like the gravelord's mark is right on top of a bonfire, doesn't it? That would imply that it doesn't move and that you only earn Eyes by invasion, since the gravelord clearly wants to be found (unless he just wants challengers or that was a test between friends).
I hope we get more clarity soon, because this covenant always intrigued me the most. It encapsulates what makes these games so different. The gravelord effectively becomes From Software and reaps the rewards of dicking over the average adventurer.