If Capote had actually written the book himself (rather than just offer advice and edits) he would have certainly claimed credit after it turned out to be such a huge success.
...he would have certainly claimed credit after it turned out to be such a huge success.
Probably not. She was probably his oldest friend and closest friend. However, a more interesting question — that isn’t asked much — is: what role did she really play in the writing of In Cold Blood?