I have just found "Blade of Crota" hive knight on earth, then i looked around and found another two "Ritual" spots where they spawned. THEN out of curiosity i went to the moon and did it again. I have video proof and will post it momentarily (as soon as i figure out how to download the video) if you want to check it out go to the gamertag Palido Tigre and watch my videos.