I would've already been impressed if Zoro simply parried the attack. But the fact that the impact of that clash knocked them both back is truly incredible.
After so many revelations it was obvious that they Will cut it in a very important one to tease us, Zoro did great against the elder, not only manage to block but push him Back.
Also Don Krieg and his vice captain are in the background in the first panel of the chapters, he looks really good with long hair, it seems he make it to the New World
„…is a traitor.“
That’s what Vegafraud meant to say. There is a traitor among the D. and it‘s Blackbeard. He is the only D. that‘s different from all the others (who are good, kind people). Blackbeard‘s ancestors were part of the Ancient Kingdom but betrayed them. That‘s why the 20 allied kingdoms managed to defeat the AK despite AK being so technologically advanced.
I think maybe Vega wanted to say that they are exceptional leaders who can bring about true peace, and that's why they're considered the enemy of the celestial dragons? Ace died to further the cause. Dragon is literally leading a revolution against the world government, Luffy is doing the same in his own right.
But knowing Oda, there's probably something more to it that has to do with Devil Fruit powers, or maybe awakening.