I have a gut feeling your interesting white seedling is a Sweet Surrender baby. I think Harvey was fooling around behind Winnipeggy's back!
I've mentioned quite a while back the numbers of pollenless seedlings I've had out of Mont Blanc breeding, even though it is a variety with pollen, crossed with other normal pollen-producing lilies. I've eaten most of them, but I noticed a few days ago that one has snuck through. It's flowering now. I'll try to take a pic and take note of how long the flowers last. Maybe I'll relent on it and experiment with it. I could still find a bit of asiatic pollen around to cross with it.
A side-note... I relented on Sweet Surrender after your defence of it, Rick, and seeing some seedlings yourself and Hank posted. I've kept a few and done alot of crossing with it this year. In the same vein, though the flower doesn't appeal to me, I'd put Harvey on a list of desirable breeders. If it lasted so well for over 45 years it certainly has what the next generation of lilies needs!