the cool thing is that the staminode is transluscent and the entire inside of the pouch is all spotted and shows through the pouch (you can sort of see it in the pic, but shows though better in real life making the pouch appear darker).
The base of the plant is also lightly spotted with purple. Just the base, not the entire leaf underside
I think this is a older cross because the seller seemed more like a older person, and he said he has large specimens he divides from.
Sukhakulii does look like the other parent (and I could imagine someone naming one a Mad Max I), but based on Cribb there is no purple on the undersides of leaves. Is there purple on the base of any of these guys? This cross is registered in 1989 as Tatonka.
And the other thought is that it could be a wardii, but they are less popular
I hope it's not complex and impossible...
...this was going to be a plant I was going to dump, the picture on eBay wasn't amazing I don't know why I bidded, but the bloom turned out alright in person so I'm keeping it
the eBay pic: