I finished Metroid: Other M (I know, my first mistake) but the story line about the "deleter" never really resolved. Does anyone knew what happened to that guy?
71 Answer
Yeah that subplot is mostly left dangling for no real reason. There is decent evidence as to how it ended though.
When Samus is lead to the Bioweapons Research Center, she meets MB. After Samus leaves at the end of the cutscene someone from the 07th Platoon comes in (one can assume this is the Deleter) and gets a shot at MB. When Samus returns to the room later in the game, James Pierce is seen dead on the spot.
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