goku can destroy planets in base form easily, by ssj2 he is a solar system buster, when 2 people fuse their powers are combined. vegeta destroyed a planet no problem with a power level of only 18000 in the Saiyan saga. ssj1 is a 50x power multiplier. therefore when goku and vegeta fuse into vegito their power at super vegito level was nothing short of galaxy buster ability. the most destructive power naruto has shown was when he cut the moon in half, and piccolo from dbz done that with a power level with less than a thousand. and vegitos power level is in the billions, vegito is way too op for naruto.