I initiate a turn with my handlebars, but the lion's share of the actual turning is done on the rear. This is the same on a bike or motorcycle. It's damn rare for a motorcycle racer to consistently slide the front tire (some of the best do it). They all slide the rear. Hell, some of them finish the last 1/2 of the corner with the front in the air.

I can hit a pretty good bump mid-corner, skip the front and not dramatically change my line. The whole bike leans. The front and rear should both wear the sides of the tire similarly if it the wear was an issue of cornering. The weight difference might effect the rate of wear front to rear, but by itself it shouldn't effect the wear pattern.

My observations are saying to me that the wear is coming from straight line riding, which should be where the tires wear the least (although they spend 95+% of their time rolling straight). Keep in mind, the side to side motion I noticed was small. Maybe 1" either way. It was enough that over many miles it would cause wear issues, though.