[gumpzilla]

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What youre talking about here is called the "Delayed-Choice Quantum Eraser" experiment. This is an extention of the beam-splitter experiment. Since we are talking about a double slit experiment in this thread, a simple version of the quantum eraser experiment is all that is necessary to convey my point. Both the eraser experiment you mentioned and the one I delineated are valid in explaining this counterintuitive phenomena.

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Except I believe yours is not physically possible, and mine is. This seems like nittiness, but if there were no way to actually set up an experiment that would measure something like this then it would be a worthless subject to argue. Even in the Bohr-Einstein style thought experiments to try and hash out whether the uncertainty principle made sense, a key point was that they were always talking about real physical systems and behavior.