Board Thread:General Discussion/@comment-26006155-20200107155350/@comment-26907577-20200211174832

There are a lot of moving parts one theory over, in "Resets-In-General".

This theory? That "The-Key-Was-There-All-Along"?

No moving parts. Only a contradiction.

The last point is my conclusion. Debunk it if you can, let it stand if you cannot.
 * 1) Frisk gives unique reactions (the passphrase/looking bored/asking about the triple-secret codeword) to Sans each time.
 * 2) Per #1, Frisk or Chara remembers their own resets.
 * 3) Chara gets corrected by Frisk on Frisk's actions.
 * 4) Chara narrates.
 * 5) Per #3 and #4, Frisk and Chara are in communication, and it is irrelevant which one of them- or both- remembers.
 * 6) Per #2 and #5, we should remember we have the key even after resetting.
 * 7) We cannot open Sans's Room without first talking to Sans, even after talking and resetting.
 * 8) Per #6 and #7, the key was not on our keychain until some point during Sans's lecture.