A lot of them end up in A category because of the insane power numbers. Much less of an issue in the lower categories because they move up. A category has relatively few racers, so the zPower riders end up as a much larger proportion of the field. Plus some legit A category riders can draft a zPower rider to the finish (where the zPower rider can’t sprint due to the Watt cap). It’s definitely disruptive to have one zPower rider in a field of 10 As.