Reason why completed ultra instinct

We've seen goku in this form twice (incomplete) this is the third time and now he has suppass the gods,but not all know why,just like vegeto and gogeta.you see you need two full blood sayians to make this fusions,when vegeta was falling off the stage he gave goku his last energy before that everyone do donate energy to goku for spirit bomb,but never has vegeta ever donated until ep 128,it was like fusing with goku (not physically)as vegeta acquired power bound blue and goku incomplete instinct vegeta energy was enough to trigger goku to his new found form,and ultra instinct requires all seriousness,take a good look at gogeta and instinct face,they don't laugh while fighting,what am tryna say is that there's no way goku can master it withing 40 min in dragon ball return of freeza when vegeta and goku were training with whis he told them about the power (didn't mention the name though) and said it's not easy too master,either it was vegeta energy or jiren pushing goku,I think I will go with both mostly vegeta's energy.