My gf mentioned this right away, but I thought an explanation, while far fetchey, was plausible. Note, I have not read the books.
Anyway, once the crew heads into the maze, gally soon after follows them, probably taking a weapon. My guess is he planned to kill any remaining survivors that came close to beating the maze, or anyone he confronts after the grievers eliminate some of them. He doesn't want the maze beaten, is his goal. He follows the crew very closely all the way to the end where he is confronted by a griever. He kills the griever but is stung in the process. He witnesses the end of the maze, and once he obtains a key, or an eye or whatever, unlocks those doors. Either he knows the sequence key lock cause he is such a busy body or cause he's high ranking, or alternatively once the code has been entered once it doesn't need to be entered again. Just opens with a key. From there he can walk right into the lab.
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Technomage001
9 years ago
The only thing I could think of would be Gally talked the group that was left behind into going after Thomas. So they were following them close enough to see what direction they were going but not so close that the first group knew they were being followed. Everyone in the second group died fighting a griever along the way except for Gally who was stung and picked up one of the devices from a smashed griever next to the closed walls which caused them to reopen. The portal with the combination had been left unlocked by the first group. While the first group were watching the recording Gally found a gun and then found them.
I couldn't see Gally as a spy unless there was a scene in the movie that supported such a theory, I could say this testing thing was actually run by humans who were being controlled by an alien race who conquered the planet and were testing humans to understand them better but nothing in the movie supports such a story.
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