I think your tires are too far used for you to put one new tire on. Kind like when you have a flat on one and the rest of the tires are at half life, might as well put 4 new corners on instead of just one.
I would say as long as you're within 3/32" you'd be fine to recoup your tire mileage. That said, the way the system on the jk is designed as far as ESP and ABS is concerned, it won't notice a difference - the sensitivity is too low.
2010 Magnetic Toyota 4Runner Trail Teams
As long as your tires are not over worn for some reason I probably would throw the spare in and just skip its turn to be the spare in the rotation. By the time you get through all them it will start evening out.
I have always rotated in my spare every 5-7k miles. It has saved me a lot of tread life. I've had 2 jeeps and 2 broncos ( the only vehicles with full size spares) and it is a tread saver. 11k is not too late to start.
The right front wear is due to the fact that we make more left turns and u turns than right turns. That puts stress on the right front tires. I drove patrol cars for 30 years....first tire to wear out.
Tire wear is highly dependent on how you drive your vehicle. Long commutes and DD do wear on passenger front. However, heavy foot and rear wheel drive also wear on back tires. Offroad performance throws other factors into the mix. My woman is hard on sidewalls and potholes... lots to consider.
Where do you think the best location to move it to would be?
Front tires wear faster. I go spare to right front, right front to right rear, right rear to left front left front to left rear and left rear to spare. That way the tire that gets the least wear in the last several thousand miles (the spare) gets rotated to the highest wear position.