Yes it would work, but that would mean that the enduser would have to make a conscious effort to make a certain percentage of color images in-between...
The developer doesn't lose it's magnetic properties, it loses it's tribo-electric effect ... that is static electrical properties ... when the resin...
Yes. A drum refresh places a layer of toner on each drum, then wipes it off. That additional use of the color developing units helps keep it stirred....
On fill areas >65% you'll see bubbly voids, either to the front or to the back of the page. It's rare to have both developer spacers fail at the same...