We can hardly "prove" anything in SW vs. debating. We can just establish that our model is more probable than not, which is enough. Nobody's building bridges on this information.
My point is: this brand of speculation is far more flimsily than the norm. Feats are completely thrown out of the window, as well accolades pretty much. It's basically built on pure power-scaling, and nothing more.
It's kind of weird that you call out Nova for not "definitely proving" anything, but then vaguely claim that Valk and Luke share a great deal of parity because Luke didn't reach his full potential, which is both a double standard and a bizarre non-sequitur.
Not really a double standard, as Nova agrees that Luke and Valkorion does indeed share parity. I was just applying the Tenebrous > Vader argument, to the Valkorion < Luke one.