Title says all.
To me, it would be plausible, since we haven’t seen the pilot of the Europan Pyramid
When Ghost speaks to us when “the darkness” is speaking to us, it uses first person
Granted, the idea of the Witness is new, but they could retconn that to being the pilot talking to us
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While Clovis calls it an entity I think more of a object that is used as way for the witness to speak through or see through Ie: the egregore on the leviathan and glykon are something like what I described the same can possibly said for clarity an object that the witness used to talk to Clovis