Disclaimer: this theory has many holes and is extremely flawed
I think that Adler is the mole because he gets suspicious of Bell in the safe house in the cold war campaign as well as ?si=OmtXrtfiTEof4GWd https://youtu.be/t6QkmkGGHSQ?si=7P2R77Et DgKOhpg). There are many videos of this and those are just 2 examples. I think Adler gets suspicious of Bell because he doesn't want Bell to remember Adler being with him prebrainwasing. If Adler worked with Bell before the brainwashing it would explain why he has the soviet uniform in this part of the campaign (https://youtube.com/shorts /KoZPKpcxOwg?si=epN3NalopXNUz8ci). If Adler worked with Bell before the brainwashing then it would've made it easier for Adler to click with Bell after the brain washing since Adler knows how to get Bell to like him (albeit pre them changing BelI) and Bell would still be able to recognise Adler deep in his brain from when they worked before the brainwashing and therefore automatically or at least easierly allying himself with Adler after the brain washing.
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I mean it doesn’t make sense with the “bad endings”, since Adler would have no reason not to reveal himself at that point.
But if we pretend those don’t exist, then it would explain why Adler was so quick to eliminate Bell with the “good ending”.