'The Good, The bad and The ugly' Question!!!?

Angel knew Bill Carson was dead. he has his sources, which were confirmed when he had heard Tuco answering at Bill Carson's name. he realised Blondie and Tuco were after the confederate gold, so knew they must have known something about its location. he knew that he could beat it out of Tuco, but wouldn't be able to beat it out of Blondie, who has the most vital part of information about where its hidden, so needs him. he sees a weakness in Tuco which he doesn't see in Blondie