Tire wear/ driveline question

Hi, I'm putting back on the stock A/S Yokos that came with the 2.5L CX5 AWD (removing the Michelin X-ices 3) I noticed one of the tires last fall had less tread then the other three the tires have about 12K on them and I wanted to know which one wheel is more of a drive wheel. I have alot of BMW experience and on all the RWD and AWD cars the right rear tire will wear the most. I'm assuming it's one of the front wheels on the CX5 but not sure how the diff works. Side notes: tire wear is even on all four tires and pressure were check often. I would say the tire in question had 1.5 to 2/32 less tread then the other three tires. thanks Jeff-

Right front is primary drive wheel.

I have this with one of my tires too at about 21K miles. Thanks for the info on the rt front, I would have thought that with FWD both tires would interact equally.

thanks