I would venture to say that if Coupon cigarettes only issued a single series of cards in 1910, and were never heard from again, Burdick would have unquestionably included them as part of T206. It is only because Coupon issued subsequent series in 1914 and 1919 did he face a dilemma: include them with his T206 designation, or join them with the later Coupon issues? If there is any correspondence about it from that era I'm sure he was asking other collectors what they thought. In the end he had to make a choice, and the three Coupon series became T213-1-2-3. That's my theory.
And regarding Leon's point that the ACC is sacrosanct and shouldn't be changed, I fall somewhere in the middle of the argument. There is no reason to make any major changes to it, as Burdick did an incredible job given how little was known about the history of cards. But a little tweak now and then couldn't hurt. I bet even he would be for that.
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