Well, there are two more Denisovans according to their mitochondrial genome. There isn't enough nuclear genomic data from either to measure the distance to Neanderthals or confirm the alleged admixture with Melanesians. Too bad, because if it wasn't there, it would confirm my conjecture that the flow was from modern humans to Neanderthals.

The "hybrid" is just more confused terminology. If we simply acknowledged, that Neanderthals had higher genetic diversity than previously thought, the Denisovan and the so-called hybrid would just be a Neanderthal. We don't talk about hybrids of Europeans and Africans either, do we? If I remember correctly, the admixture wasn't confirmed in the hybrid, either. I think, nobody looked.

The root of this nonsense is that Neanderthals were thought to be genetically very similar, especially their mitochondria. The reason is that prior to 2009, it wasn't possible to routine sequence the mitochondrion, let alone the nuclear genome, of some random fossil. Therefore, all fossils were pre-screened using a PCR test for a mitochondrial mutation specific to Neanderthals. But not all Neanderthals have that mutation, so those that were sequenced were very similar due to a technical limitation.