Well Goku normall always fights with the intention of not killing his enemy so inevitably all his attacks wouldn't be lethal in their nature. If you read the OP it states that morals are off, therefore Goku would not hesitate to kill them.
Then I refer you back to the Dodoria vs Vegeta battle. Vegeta was merely 2000 higher than Dodoria yet he completely overwhelmed him in seconds. Vegeta shows that despite only being 2000 higher, if the killing intention is there then someone with a higher power level can kill someone without difficulty.
Or an even better example, the Vegeta vs Zarbon battle. Once again Vegeta was stronger and was easily able to dominate first form Zarbon, yet when Zarbon transformed into his monster form which was a mere increase of about 7000 he easily dominated Vegeta and left him in a near dead state in what was a very short fight.
So basically it was Zarbon (23000) being beaten pretty soundly by Vegeta (24000) and then Zarbon (30000ish) absolutely destroying Vegeta. Even slight power level changes make a massive increase in the outcome of a battle and in this battle Goku at Kaio Ken x3 would be 10,000 stronger than Gohan or Krillin. Even if he can maintain the form for only seconds, if moral are off and he's going for the kill it would be more than enough time to take them both out.