Goku's Super Saiyan Blue (Universe Tree Power) fits comfortably among the latter. Normal Super Saiyan Blue was somewhat contentious on initial reveal and in the years following Dragon Ball Super ...

Only Goku has mastered ... which is called Super Kaioken. He also uses Super Kaioken inthe Dragon Ball Super anime, and he later combines Kaioken with Super Saiyan Blue (Blue Kaioken).