It sounds weird but hear me out. The lore suggests that the Felwinter we know was actually a stand in since the last time he had a memory wipe he couldn't remember his name and had to go with what "his ghost" told him; banshee, as we all know has memory issues. In recent lore, it suggests that felwinter is connected to Rasputin. Banshee some how knows how to rebuild golden age/warmind weapons like pocket infinity and sleeper stimulant. The auto rifle banshee has been working on for the last 3 years appears to be the same auto rifle that Rasputins frames use. They are both exos If Felwinters ghost did revive some random exo in order to protect the real Felwinter then that would mean the real Felwinter doesn't have a ghost. Banshee, as far as we know doesn't have a ghost.