Jerome,
You nailed it in your explanation. I've always known JJ was not in the 211s, but I never knew the why. You make a lot of sense. One can dream, though, that someday one of the other 39 might surface, even as a proof, in the 211 set. Then you would see some serious searches for more examples. In the meantime, I will keep looking to complete the known set. I am getting there, one card at a time. Only 60 more to go.
Jason, sorry to off track your thread, but these 210/211s just fascinate me. And of course, I started my 210 collection with series 8. Many more of those to go.