actually angelo was promoted to captain of gotti's old crew and when frank decicco got killed he also served as co-underboss with gravano
Ruggerio was never Underboss or "Co-Underboss." When Gotti took over, Frank DeCicco was Underboss before he was killed. After that Joe Armone became Underboss until he was imprisoned. Then Frank Locascio became Underboss but later switched positions with Sammy Gravano, who had previously been Consigliere.