it theoretically might negate some tolerance rise from each one
the cross tolerance isn't 100%, rotating benzos will just build up your tolerance to each individual molecule, the tolerance to te muscle relaxing effects will be the first to rise (very very fast), then the hypnotic effect, then the anxiolytic effect, benzo tolerance takes ages to drop, so in the longer term i doubt rotating benzos will be "beneficial"
by "each individual molecule" what do you mean? it sounds interesting as i knew some benzos had different profiles of effects but i thought ultimately they affected gaba in different levels.