Only when two individuals belong to the same specifies does it make sense to compare them.
For example, "is Fred taller than John?" is much better defined than "is Fred taller than [some porpoise]?"
It's certainly possible to compare species themselves, e.g. how does the typical orange differ from the typical apple. But the idea behind the popular saying concerns individual comparison, not species comparison
If anything latest AP scoop [1] definitively refutes such theories as it shows internal memo as late as Jan 14 spoke of h2h as something "evidence suggests" is "possible"
1. I'm well aware of that. Is that the only new evidence that's come to light since the piece I linked to though? Would have expected something more solid than unnamed sources from inside national security (see: big hack)
2. I'll grant that that's possibility in the exact same sense in which I grant the centralized cover-up theory to be a possibility, and in which I grant both the lab creation and the lab accident origin theories to be possibilities. But I'm not interested in possibilities. What I'm interested in is positive evidence supportive of this or that theory.