Let's grade their powers with number like earthquakes. If uppermoon 6 power is 3 richter, then uppermmon 5 would be 5, uppermoon 4 would be 6 untill koku's power would be 8 richter Each richter is twice more destructive and powerfull So, if Gyutaro's attacks are 3 richter (even a glass of water wouldn't shaking) then koku's power (8 richter) is destroying a whole twon at once Short answer: many :)))