A couple of reasons they might seem more common on T206s:
1) Even if the stamping rate is the same across issues, there are just so damn many T206s out there that there are many thousands of stamped ones and most of us have seen well over 100 of those by now.
2) Many stampers would be more hesitant to stamp a T205, T207 or any other issue that provides a player bio or other reading of interest than a card whose back is blank or otherwise identical to those of many other cards in the same set.
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