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A Secret Messenger ...
You're contradicting yourself here. You initially say that it's not canon, but then by saying that it's a prequel to the series, you're saying that it's directly related to the series, which then means you're saying that it's canon. It is not. GSL is not, nor was it ever meant to be a prequel to the TV series.
The movie is set in an "alternate universe", and has NOTHING to do with the TV series version. That's what they've done in GSL, it's what they've done in ALL of the recent Kamen Rider movies. The movies are a way for the writers to try out new ideas that wouldn't have been possible/allowed to be done in the TV series version. The movies have NOTHING to do with the TV series versions in terms of the behaviour of the characters or anything that happens in the plots/stories.
I think the Hibiki movie is the closest to actually being a "canon" story. The only problem is the issue of the appearance of Armed Hibiki and Orochi. If you ignore those two points, there really isn't anything to keep it from fitting in with the television show. But then again, it doesn't really *add* anything to the show either, besides the origins of Takeshi.
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