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JimBTo add to what I said above, it has been postulated here that Coupons were on thin stock due to packaging necessities (thin paper packaging that could be ripped by harder stock). We don't know why ABs are thinner since it seems AB packs have been found and it seems they could have had a full-sized t206 in them. So their thin cut is a bit of a mystery, though it was long thought that the reason was a smaller package. Maybe the interior packaging still required a smaller card. Regardless, it seems that adjustments were made to accommodate the specific needs of specific brands. So why not on a short run special production?
JimB