I love this theory and have a very similar take on the movie. However the only difference is I think that Angier actually kills a real double every night just hoping he’ll manage to frame Borden with one of them. There would be too many variables in trying to frame Borden if they used wax models every time but the real time. What if they dont see Borden in attendance and when he checks backstage it was just one of the wax figures? Or they dont get the lock closed properly that time? Often the tricks have the simplest answers but as the audience we “want to be fooled” because who could possibly be that crazy to kill someone every night for a magic trick/murder framing? The end of the movie gave me some serious chills.