In the offseason, the Giants took a chance on a minor-league free agent with gaudy strikeout numbers in the minor leagues, but little history of success in the majors. He was previously categorized as a prospect because he missed so many bats, but dodgy command and control dimmed his star to the point where he was available on a minor-league deal. The Giants took a chance, and after he had a strong spring, they put him in the bullpen.
Also, I’m talking about seven offseasons ago, with Santiago Casilla. Sorry, re-reading that I can understand how you might have been confused, but the Giants won three championships with Casilla in the bullpen, including a season with him as closer.