@Razh:
Imo means "in my opinion".
And please, don't go there. It's been discussed plenty. Better to just wait and see.
But, the way you asked a question, we could ask others.
For example.
Why would Oda make Dragon Luffy's father and not say?
Why would Oda make Sabo survive and not say?
Why would Oda make Shanks and Buggy Roger's crewmates and not say?
Why would Oda show Urouge's ability and not explain?
Why would Oda anything and not explain everything about it?
You're talking of oranges and apples like they are the same fruit! Sure they are both fruits, but they are different ones.
Devil fruit powers revelations are revelations, but not any kind of revelation. Oda always revealed Devil fruit powers when a character is revealed or in one important battle of that character. The characters where Oda kept the powers secret for a long time, he always showed multiple hints about them having a devil fruit power(Ex: Doflamingo)
Luffy father, Dragon, is till today, mostly a mystery! When he appeared in Loguetown was obvious that his role was being someone mysterious that we would be explained later!
Sabo death was totally played as a mystery as well! Not showing his body, but only his hat, when he was attacked, the hints with Dragon. All of that was played for later.
Buggy and Shanks information was displayed in layers. When we knew that he was Shanks crewmate, that was all the information needed for the flashback. The later hints
about Buggy already being in the Grandline showed that that was played as a mystery as well and would be showed later.
About the supernovas, Oda told the power of some and left as a mystery others, like Al capone(or what is name was) and Apoo(I'm not sure if it was ever explained :P).
Oda doesn't have to explan everything! Is not what is being discussed here. The thing is that Vergo was totally explained in Punk Hazard, it wasn't left any space for anything. Are you saying that Vergo is such an important character that Oda will retcon him, to give other explanation about something that already was explained(his body toughness).
The thing about Vergo is that Oda introduced him in that arc, showed him fighting multiply times in the arc, showed him being defeated in the arc and showed all his skills(rokushiki and Haki. And with that everything about his battles was explained, even Sanji comment about his body being like concrete), except, for what you believe, his devil fruit powers. Why would that be?
Note that you don't have any defense for your argument. If things worked that way, I could argue that Luffy from the beginning of the series had two devil fruit powers and you couldn't disagree, because his my opinion and because Oda don't need to explain everything!
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@King:
That's not the point. Law wouldn't be able to fight properly with Vergo constantly crushing his heart. Neither Monet or Smoker had this problem.
but what has that to do with him not being able to do a room, get his heart back instantly, and than avoid Vergo Soru? And what has that to do with Law electrical power that did nothing against Vergo? And what has that to do with Vergo beating the shit out of Law with his Bamboo stick? Nothing of this as anything to do with Vergo constantly crushing Law heart, but Law even without that handicap Law totally lost against Vergo.