Super Saiyan Rage lacked build-up and was a plot device to conclude the arc's storyline. The contradiction between Super Saiyan Rage and Super Saiyan Rose raises questions about their power levels.
Caulifla's Super Saiyan 2 form shows potential to be Goku's successor. Future Trunks' Super Saiyan Rage form is powerful. Goku is one of the most iconic shonen protagonists of all time.