Yeah I am clueless. I dry poplar and pine two years. And even though it is moisture content wise burnable in six months to a year, you ain't gonna believe the burn time difference if you let it stay on the stacks longer. And that's my take.
I have no experience burning poplar, but agree with you 100% on pine. Last year I burned pine that was about 8 months dried, and it certainly caught and burned, but this year I've been burning a lot of it that has been drying for close to 18 months, and it is burning wonderfully.