User blog comment:Piccolo The Super Namek/Edit Levels/@comment-2205861-20100925170044/@comment-2205861-20100925171434

Al right, go SSJ4 but not 5. Vegeta was more stronger than Buu in GT. So if Baby infected Vegeta, Goku took SSJ4. But if Buu absorbed Baby (who is very weak) then Goku will only have to go ssj4. He doesn't go ssj5 in this whole saga.