Your last line is the main point. We see his real intention in the Moreh.
It could still be, though, that according to the Raavad, invoking unknowns is equivalent to leaving it open ended.
The Ravvad didn’t merely say that some people won’t like his Pshat. He ends with Vechal Zah Einenu Shova Li, which means that he felt compelled to give some answer but he didn’t like his own answer and would rather it not be brought up.