That's not so much the problem as the heights and weights are proven terribly inaccurate.
I'll be using Starkiller and Siegfried from SCIV for this example, since they took Starkiller's information directly from his game, and Starkiller's model is based almost entirely on his voice actor, Samuel Witwer, so we have a near real life comparison. Using the SC4CCedit and giving them both the same style, you can plainly see that they are approximately the same height, give or take a half inch. This contradicts their listed statistics: Starkiller is listed as 6'1" (185 cm), 178 lbs (80.7 kg), while Siegfried is listed as 5'6" (168 cm), 110 lbs (50 kg). There is somehow 7 inches and 68 pounds of difference between two men that look nearly identical in terms of build.
I REALLY wish I had pictures for this, but alas, my stuff is back home in Seattle. I really wish someone would rip the in-game models so you could all see what I'm talking about...
Basically, using the height and weight information given to us by Namco to say someone is or isn't someone is really dumb unless it's a very large discrepancy that you can actually see in game, such as saying that this Nightmare couldn't be Amy or Astaroth.