To be honest, I'm not even sure how hard he would 'fight' about the Correct Way to Play D&D. By the time of his passing, I had the general feel he was long past D&D other than in a historical/past sense.
I spoke a lot with Col_Playdoh here, but never met him in person. At one point, he was posting more to me than anyone else - I looked it up.
He was, in my impression, a very nice, opinionated, and irascible person.
Significant events my recollection, all here if people want to check the receipts:
(1) I told him my company was offering AD&D: Accidental Death and Dismemberment insurance, and that I knew he’d sold insurance, and asked in AD&D was an inside joke name.
He replied no, but that would fit a lot of campaigns he’d played in.
(2) I told him about the semi-verbal MR NPC child in the Temple of Elemental Evil PC game (2003), mentioned it was 3e rules, and asked if a cleric could cure MR in AD&D.
He said, sadly, Cure Disease wouldn’t work because it’s a low Int stat. My impression was he was sympathetic to the issue, and understood the wish fulfillment aspect of the game - that my question wasn’t about gaining XP, but more about “can you make it a better world than ours” and his reaction was basically “life contains tragedy, so should the game”.
I’m not sure if it was in this exchange but at one point he said, if I remember correctly, he didn’t like editions after 1e, but he tolerated them.