And Goku didn't do the same???
Vegeta three-shotted Kiwi.
Goku had insane amount of strain too because of the Kaio-Ken x3, he wasn't even prepared to use it when he came to earth.
Possible.
Even-though they probably are inconsistent.
They are. Goku's KHH on Piccolo, Goku's KHH on Cell, big difference of damage, but Goku was the stronger one in the first case. In the same saga, Dabura's blast did less damage on Gohan than Vegeta's punches on Goku's.