Regarding SoL there's two arguments to end Kizaru.
1. He doesn't start at SoL as proven by Rayleigh and by the fact that he needs to accelerate.
2. Putting Kidku at SoL via dodging light speed lasers and tien's tri light beam.
Goku spent 117 days running to King kai from snake way
The length of Snake Way is around 625,000 MILES.
that means Goku's running speed POST-Raditz is only 148 mph. barely faster than a car.
Still 5x faster than Usain Bolt nonetheless
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I think it's arguable that Beginning of Z Krillin is moon buster anyway, since master Roshi was a moon buster
But let's say you're right. So what, even if he's only 50% moon buster? It's far more than enough to solo the OP verse.
One nuke from Krillin, and any top tier from OP verse gets one shot.
Sadly not enough to destroy Akainu, who scales higher than world breakers like Old sick Whitebeard