[ST01-015_p5] - Gum-Gum Jet Pistol (Super Pre-Release Starter Deck 1: Straw Hat Crew)

If the power of a Character with an original power of 6000 or less becomes 7000 or more due to an effect, can it be K.O.'d by this [Main] effect?

No, it cannot. This effect can only K.O. a Character with a current power of 6000 or less.