Some INNOVAtions at Discraft must have occured because Z-Drones have been mucho desired by DG'ers - but they proved to be too heavy in Z plastic for PDGA approval - and hence were only offered in D...and I believe also now in FLX.
So, Z-Drones would be HIGHLY coveted...and if only offered for KC WORLDS that would get my vote.
Not sure where you got that information, but Discraft has offered us Z-Drones. I have no idea why they couldn't make them lighter....they are not wide-rimmed like the Boss with all the plastic and weight in the rim...it doesn't make sense, which is why I'm curious where you heard that. PM me if you can remember where you saw/heard that.
John, what Otter is saying used to be true, but they must have come up with a plastic blend that works. Older molds like the Drone actually take a larger mass of plastic to pack out, so unless you lower the density of the plastic, they'll come out overweight. You can find a quote from Keith Murray from 2005 saying that they couldn't run them at that time. The Boss actually doesn't require a lot of plastic to make. Dave McCormack had the same issues with the Demon mold for a long time until he developed an E-Like blend that had a low enough density to fit into the mold.
But back to the question at hand...Z Drone. Especially if it's exclusive. Personally, I'd like a Z Comet to be exclusive, but that's another issue