As you said, the chap "Broccoli wanted". But that's not the same thing as saying he was the "only one".
It is if it's the case that Broccoli's vote is the one that carries most weight. Remember the "making of" doc on the LIVING DAYLIGHTS DVD in which it's mentioned that (I think) Sam Neill greatly impressed John Glen, Michael G. Wilson and whoever else but totally failed to tickle Albert R. Broccoli's fancy in any way whatsoever and because of that didn't have a chance?
But we also equally know that Martin Campbell was pushing hard for Henry Cavill and I believe he has said so, as have others, in post-CR interviews.
But how much water did Campbell draw? So what if he was pushing for Cavill? What if my grandmother was pushing for Cavill? Or Dougray Scott? So what? If it's the case that the most senior producer on the picture whose surname is Broccoli gets to call the shots, then Campbell's opinion isn't really of any more importance than that of John Q. CBnForumMember. Campbell might have been championing Cavill at the same time as I was calling on this site for Clive Owen, but if Broccoli had decided that it was going to be D.W. Craig, Esq. then that was that and, yes, Craig was indeed The Only One to all pratical and realistic intents and purposes.