In Universe 4 in Age 774, in this timeline Buu absorbed all the Z-fighters, becoming even more powerful than before.

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[Narrator]: ”He absorbed anyone with interesting skills... and traveled throughout the universe, spreading both good and evil, depending on his mood...”

Back to the Multiverse Tournament…

Amused, Zen Buu reveals that he’s opening a secondary tournament in parallel to this one.

Zen Buu: ”All the “God-tier” fighters are obliged to participate. That even includes you, Gohan. I’ll dish out upgrades to anyone who wants, regardless of their level. And dumb entrapments techniques are banned.”

Surprised by the hostile response by the participants (including U16 Gohan, U16 Bra (SSJ2)…

Zen Buu: ”Seriously?”

Evil smirks..

Zen Buu: ”Well then…

Zen Buu then clones himself multiple times & attack all the contestants.

Zen Buu: ”All of you, have at me!! It seems I need to teach you a lesson! 😈”

…

[Zen Buu (talking to the audience): Previously on DB multiverse, will the magnificent, omniscient & ever humble Buu be able to overcome this unsurmountable threat? Mini Buu: Yes. Yes, he’s going to smash them 😏]

The clones of Zen Buu with evil smirks, rush you all. First setting his sights on Gast Carcohl, as Gast prepares to intervene, he is restrained by four rings made of magic, the Dark World Lightning, & is consumed by holes of antimatter & microdimensions, leaving nothing but his head behind, which Buu quickly disposes of.

Zen Buu: ”Finally! I prepared this trap hours ago! I’ve absorbed countless magicians, so I threw in a little of everything, just in case. Of course, you can leave nothing of such a powerful Namekian brain.”

turns to the rest of you, including an angry Vegito who turns SSJ2.

Zen Buu: ”Gast’s the only one that worries me, I had to take my precautions… Oh, against the rest of you, I promise I won’t use any magic!”

All the clones of the omnipotent Buu rushes you!