I think the seedlings that Larry doesn't want you to spread around is the ones he has more than one of, and you may not be the only one with that seedling. The one Michele and I got was one he had lined out to register and decided he would not register it for some reason. He did say it was a good parent for patterns. He sells lots of one of a kind seedlings, I have been there during bloom season when the greenhouse would be full of people buying seedlings.
I have sold several seedlings that I would tell the buyer the same thing because they were not getting all of that seedling. Here is a seedling that I have sold several double fans over the past few years. I would not register the seedling because I think the scape is too short (20-24") for a 6" plus flower. It doesn't carry this short scape to the babies and I am still useing it today.