Well he did patent the design seen in the Viewloader Revolution (agitated loader), had a patent on a belt-drive loader (forcefed loader, and created/marketed the Warpfeed (forcefed system). The reason he left those additional ports on the Classic R/T was to allow for the use of "future air-powered accessories" so that could be it, too.
*Edit:
Just read the article; didn't mean to repeat what was in it exactly LOL. I guess that line stuck with me from the first time I heard it 17 years ago.
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