I know that Johnson wanted to destroy the Halo and the Ark, and destroying the Ark pissed GS off, but why did Guilty Spark kill him if there's also the Greater Ark somewhere else?
Is it simply because Spark didn't know about the Greater Ark? Was the Greater Ark lost? Or did 343i decide not fix anything in that cutscene when they created the Greater Ark?
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He didn't know about the other Ark. "Compartmentalization, in the event I was ever captured by the Flood." To paraphrase, can't remember his exact quote.