If everyone would simply go back to the source document in the Tire Rack link in Post #4, it might be easier and require less guessing, speculation, and confusion?
"While the entire Tire Identification Number is required to be branded onto one sidewall of every tire, current regulations also require that DOT and the first digits of the Tire Identification Number must also be branded onto the opposite sidewall. Therefore, it is possible to see a Tire Identification Number that appears incomplete and requires looking at the tire's other sidewall to find the entire Tire Identification Number."
. . . but maybe I have misunderstood the purpose here?