In fnaf 6 we all know that molten freddy contains the souls who possessed F.Freddy, F.Foxy and ballora.

But also...

Scrap trap is possessed by William afton... AND a part of cassidys soul. (Golden freddy)(Explained in UCN and fazbear fights room 1280)

And if the fnaf 3 bad ending is cannon then Lefte would not only be possessed by Charlie (the puppet) but probably the other 4 main spirits of freddy, bonnie, chica and foxy because at the end of Henry's speech in fnaf 6 he says to Charlie

"it's time to rest, for you, and for those you have carried in your arms"

Wile showing a picture of the puppet and the 4 main spirits from the 8-bit mini game from fnaf 2. Why would he say that when the spirits have already been put to rest? Because it's most likely that the bad ending was cannon.

[Reminder that this Is only a theory]