Sorry I disagree, IMO the difference between the proto and this is night and day, you said it yourself that they used either a MOS or TTM20 body for the proto than the one they used for the product. Using a bigger body with a better shape does not slightly change the look of the figure but DRAMATICALLY IMPROVES THE LOOK as it makes the figure go from looking rather skinny to looking big. The bottom line is this looks almost the opposite to how the proto looked, with the flat chest as opposed to huge pecs the proto has and the rectangular shape torso caused by the fat suit as opposed to the V shape torso the proto has. I honestly don't get how you or anyone can think this figure looks even close to the proto? If it wasn't for the head sculpt, I would think the figure was made by a different company.
Once again I disagree, the good thing about Hot Toys is that unlike most companies their products look almost identical to their final products, maybe things like tailoring and head sculpts might be slightly off but the figure overall looks close to the proto. The CAP WS figure is the first time I have seen a Hot Toys product differ so much from the proto.
As I said, it is not a big enough difference to bother ME. Obviously, that is in the eye of the beholder (well, I thought that was obvious). This is not a matter of debate - I am not trying to tell you that YOU should be ok with the difference, just please grant the same courtesy to those who disagree with your weighting of the difference.
In terms of figures not matching the prototypes, take a look at just recent figures, all of which had big complaints about difference with the prototype::
-Wolverine from the latest movie of that name ,
-Golden Age Cap (yeesh, that expression),
-CA:TWS Black Widow
Golden Age Cap was bad enough that I skipped it.
One other point - I agree that the proportions are significantly different than the prototype for Stealth Cap, but I don't have a preference for the prototype's proportions (that V shape that some really want just doesn't matter to me). What does bug me is the reduced articulation - but not enough that I would mod the figure.
To each their own - I know some LIKE the GA Cap, for example - I am happy for them and would not try to convince them that they SHOULD dislike him. (Different discussion if you want to criticize Sideshow for not more closely matching the prototype - little to argue about there.)