Dangai ichigo vs teen goku at the 23rd BT
@supernova7005: Goku at that time is stronger than Muten Roshi who destroyed the Moon in the 21st Budokai.
23rd Budokai Goku is a Moon Buster not a Island buster.
Even King Piccolo is much stronger than Roshi yet he is only a city buster.
Even Kid goku (KP saga) was much stronger than Roshi, yet he gets his leg fractured by a stone.
Finally, Roshi himself admitted that he can't take on the red ribbon army's base, so by that logic even the RRA would be moon busters.