what if Goku learned Ultra ego instead of ultra Instinct Goku has been training for a long time now with the objective of mastering Ultra Instinct but what if he had chosen the route of the ultra ego to be fair at the beginning the ultra Instinct didn't seem to fit neither Goku nor Vegeta especially because historically Goku had used his San emotions as the fuel that allowed him to keep on fighting in fact he actually came up with a UI variation that allowed him to combine both his emotions and the technique itself that's why Goku using
Ultra ego shouldn't be as impossible as Vegeta using Ultra Instinct since Goku has already had episodes of going completely mad just thinking about ending his opponent of course with this Vegeta would have had to take the ultra Instinct route and Weis already made it pretty clear to him that he just isn't a good match for the technique so even if Goku using Ultra ego due to his nature as a warrior shouldn't be too far-fetched story-wise the current distribution of powers seems like the better choice