Yinsen had already decided to leave, and he knew how to do it. But before leaving, he still needed to handle a few loose ends.
During this time, he continued cultivating diligently, squeezing out the divine power within him. As his divine body continued to evolve, Yinsen's recovery speed also increased.
He had thought it would take much longer to recover sufficient strength, but as his divine body evolved, the recovery rate accelerated like a snowball rolling downhill. Yinsen could now clearly sense the various rules of this world and had gained the ability to leave at any time.
At this point, he had no desire to remain and waste any more time.
Before leaving, Yinsen first did one thing: he used the Dragon Balls to pinpoint Babidi's location, then teleported over and instantly killed him before Babidi could even figure out what was happening.
As for Demon King Dabura, he was no match for the current Yinsen either. Besides, his strength was only on par with Cell's. Even in a direct fight, he could no longer defeat Yinsen.
After casually killing the Demon King, Yinsen spent a little more time clearing out Babidi's other subordinates. Finally, facing the enormous, ugly spherical object, Yinsen used the Rule Power that was gradually merging with him and destroyed it completely.
Majin Buu did not even get a chance to revive. He was silently and soundlessly eliminated by Yinsen.
After doing all that, Yinsen destroyed Babidi's spaceship as well. Now he could leave without worry.
If he did not take care of these things, who knew whether Majin Buu would cause another massive crisis in the future?
Although he could choose a specific point in time to return to this world, accidents could happen in anything. If he made a mistake, if locking