JL x DP and DP x JL, as well as another one made by the Orchid Zone - I think it was a DP or a JL times something else, all turned out, without any single exception, to be PEOY.
The few DP x JL that bloomed out to be sanderianum were in fact 'laundered' plants using Orchid Zone invoice, not seed grown ones...
A bit of history, the seeds of those sanderianum apparently came from Norris Powell, who was, apart from a very funny and knowledgeable man, not very strict about reliability to say the least.
The history wants that Terry partner at that time 'made' the cross, but because it failed he got some seed caps from Norris Powell. Ray Rands on his side sold seedlings from the same batch of seeds as something x Kalimantan, there were advertisements at that time in the AOS bulletin. But all those crosses proved to be PEOY. Terry would never have done such a mistake voluntarily...
For fun, DP x JL is still sold here and there to people that are not aware of that history. As far as I know, there has never been any seedlings of DP or JL around.
As for the picture, it could be both PEOY or sand, looks more like a PEOY to me, especially with that bract in the crown, but it is hard to tell exactly. And PEOY can bloom with nearly white ovary, the slight striping coming when the flower is about to open...