Guys Deej said he can only show us the door/doorway, and Cozmo has Pocket Infinity equipped, why the hell would he have it equipped? Because the description for Pocket Infinity is "You cannot shake the feeling that this is less a weapon than a doorway"
Its the key! We need to do something with Pocket Infinity! I dont know what but something!
Edit: Its funny too cos i abandoned this idea a while ago and told my friends "all we have to do is wait for a specific mission to become the daily and it will give us that fusion core thing or the transmitter thing, bungie will decide when we get sleeper"
Then bam, new quest, it wasnt the daily but a new quest altogether
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maby solar is the key cause the vents are yellow aka solar sleeper simulant is solar the pocket infinity is solar GHORN is solar and cause now all destiny chartacters have solar maby just go with an all out solar loadout I don't know if im right just a theory and try and scan all the scannable in Rasputin and listen carefully for clues