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				But it is more likely that Elendil or Gil-galad gave the most damaging blow or vicious wound, that counted the most to the destruction of Sauron.
			
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 Probably, but sticking to the question, which was "who delivered the final blow?" we have to say Isidur. 
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				 I don't agree that Sauron was as incapacitated as you think. If Elendil was capable of nearly killing Sauron with a final blow, then why not his son?
			
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 Actually, I was aknowledging what others had said. I believe that, while Elendil and Gil-Galad weakened Sauron he still had some fight left on him, until Isidur cut the finger off. Still, I think he might have been at least temporarily incapacitated, as cutting one finger off is not as easy as it sounds :P
 I do agree with you that Sauron was drained after making the ring and therefore was forced out of his physical body.