It sounds like if the Sarge/Pachakutiq personality is destroyed or driven from its body, we'll be left with a spare Coulson with memories from just before dumb!Fitz and Simmons' wedding. Very Butch Cassidy. Who'd expect someone to bring back a dead character using (almost) the same trick twice? I don't see Pachakutiq having much foundation as an ongoing character since it seems like all it's got it "nostalgic because of Coulson's memories."