I would say for something to be worthy of classification as a T206 it must use some subset of the checklisted 524 white border cards, have been issued within the years 1909-1911 and have the name and team designation in dark brown print along the bottom border. If it was issued later than 1911 or has the text in blue it shouldn't qualify. So yes, that rules out T213-2, T213-3, and T215-2. Otherwise I include the Coupons and Red Crosses, but I'm not knowledgeable enough about T206 backs to speak about relative scarcity of the various backs. It wouldn't surprise me if "T213-1" and "T215-1" are tougher than previously believed, but a difference of, say, five spots in the ordinal ranking in that portion of the list isn't especially meaningful compared to the difference between 1st place and 6th place.
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