Floyd has to be the first, he's proven his impeccable skills for decades now against the best opposition by far. Rigondeaux and Lomachenko are really hard to separate, I'd say they are more or less equally as skilled but in different ways. Lomachenko has better footwork and combination punching, Rigondeaux has sharper punching technique, better counters/timing. Defensively they're both great but Loma looks a bit more open to the body (IMO) Rigondeaux, on the other hand can sometimes switch off a bit (which has cost him some KDs).
I'd have to see more of Lomachenko before I say he's more skilled than Rigondeaux. He's definitely just as skilled as he is, though.
You guys do know Lomachenko only has a handful of fights. The fact that we're even comparing him to 2 other p4p guys says something about this man's talent. Yes, I do think he'll beat both Walters and Rigondeaux right now. No need to wait. People were saying the same sh!t about him learning to fight like a pro before the GRJ fight. We all know what happened.
Gonzalez, Ward, Inoue just to name a few. Not my fault a lot of people don't watch a lot of the smaller weights.