I didnt say he was any more than a suspect or someone Benazir alleged to have plotted to assasinate her. However suspects are usually not regarded as credible sources on who the real criminal is, one of the reasons why the govt of Pakistan went to the UN in the first place is that they didnt trust their own institutions.
Incidentally Gul sahab is happy to mouth off to the media on the killing of Benazir, not so cooperative with the actual investigators. Its especially rich that all this is recent press is because of him decrying the UN report for not being exhaustive enough in pursuing leads and so on.