Adam wasn't second in command of the team when he joined.
Goushi never appeared in Boukenger, but returned years later to encourage the Gokaigers not to destroy the Super Sentai Powers.
Adam returned years later to lead a team to replace the Overdrive Rangers, but did not return to Super Megaforce except in costume.
Goushi appeared in two seasons: Zyuranger and Gokaiger.
Adam appeared in six seasons: Mighty Morphin 2 and 3, Zeo, Turbo, In Space and Operation Overdrive.
Goushi had only one set of powers.
Adam had four sets of powers during his ranger career. As the Black Ranger, his powers connected to MammothRanger, as well as ShishiRanger and Ninja Black.