Nope, there's no comparison here. It was shown and stated in the Champa Saga that the Kaioken had only 10% success rate of just activating it. Failure meant Goku crippled himself or even dying. Overusing can also make Goku sick and crippled him forever. It's not until recently that Goku can used the basic Kaioken with no danger to himself. So Goku couldn't just used it at anytime during the Future Trunks Saga and only resorted to it when he literally had no options left. Just because he activated it once without exploding doesn't mean he activated it smoothly. Especially when it lasted for only one attack.TheSaiyanGod wrote:
Goku during the MT Saga only once used the Kaioken, even almost dying and with the future of Trunks in danger. He was not shown perfecting the Kaioken once, but he used it smoothly against Merged Zamasu. Black could get stronger, but there came a time when he was on the edge, so much so that he took a beating of Trunks and Vegeta and had to resort to rage to get the scythe. This is not just in the manga
This mastered form of Super Saiyan God Super Saiyan, however, haven't been shown to have anywhere near these harsh limits.







