So far, Daisy's reasons not to kill Kidston are in case the wing scanner needs a lot more than just the wings (pulse, heat, blood type, heat signature, etc), and she may have mroe information or ways to open the locks that may be needed for the team.
In her world, the Office of Naval Intelligence (Halo's version of the Gestapo/CIA/FBI/MI6/KGB/MIB) is excessively paranoid and has a lot of locks for even entering a single office, and guards are trained to shoot first and ask questions later if someone looks the wrong way. Given they are working with something as sensible, Daisy would strongly lean on keeping Kidston alive for those same possible measures -- and with Loki's warning... Daisy is only afraid to kill because it could ruin the operation.
(Rather silly, though... Mythbusters proved you can fool a door's digit reader by using a paper print of a thumb and wetting it. I'm not sure if the Malnosso's machines could be as dumb as them, given differring security technologies.)
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In her world, the Office of Naval Intelligence (Halo's version of the Gestapo/CIA/FBI/MI6/KGB/MIB) is excessively paranoid and has a lot of locks for even entering a single office, and guards are trained to shoot first and ask questions later if someone looks the wrong way. Given they are working with something as sensible, Daisy would strongly lean on keeping Kidston alive for those same possible measures -- and with Loki's warning... Daisy is only afraid to kill because it could ruin the operation.
(Rather silly, though... Mythbusters proved you can fool a door's digit reader by using a paper print of a thumb and wetting it. I'm not sure if the Malnosso's machines could be as dumb as them, given differring security technologies.)