User blog comment:Awesomesix/ERB Contestants Battle to the Death/@comment-25263388-20150303045633/@comment-26209006-20150303050809

Also, Goku probably won't use his Spirit Bomb attack since he doesn't use it in the video.

"The only weapons allowed are those seen in battle, and their own physical capabilities."

Goku's "physical" capabilities don't include the spirit bomb, but extreme durability and intense martial arts.