Papasmurf said:He's not consciously suppressing, he's just afraid of damaging the planet the same way Freeza subconsciously held back when he tried to blow up Namek
Evil Vegeta said:He isn't consciously suppressing because he said he was using the attack at full-force. He only gets the bright idea of releasing all of his power when Goku alerted him to Cell's opening. You can even see the shock on his face. Gohan got motivated by Goku and powered-up his KMHMH before using it. No way was he purposely holding-back.
Goku: “Hang on! Hang on, Gohan! You ain’t putting out all your power yet! Make your power explode!”
Gohan: “I’m doing it at full force…! Any more than this is…”
Goku: “Somewhere in your mind you’re thinking of the damage to the Earth! Don’t worry about it! We’ll undo the damage with the dragonballs!”
Evil Vegeta said:Goku said Gohan was thinking of the damage "somewhere in his mind", implying it was on a subconscious level. This is why he told him to forget about it:
Goku: “Hang on! Hang on, Gohan! You ain’t putting out all your power yet! Make your power explode!”
Gohan: “I’m doing it at full force…! Any more than this is…”
Goku: “Somewhere in your mind you’re thinking of the damage to the Earth! Don’t worry about it! We’ll undo the damage with the dragonballs!”
Unless you think Gohan is outright telling a lie, I'm sure he believes he's using all he can. The whole scene is stupid, anyway. He's deliberately holding back to not damage the Earth, so it makes more sense to let Cell overpower him and destroy the Earth instead....
Even after Goku told him to forget about any potential damage to the planet, he still didn't do it. Gohan needed an extra push to tap into his remaining power after Vegeta created an opening, which he seemingly couldn't bring out normally.
Papasmurf said:Well if he was serious against regular PC his Kamehameha should've obliterated him. I think he's just capable of holding back some effort, as it's been stated and shown that power gets to his head in SSJ2
That's logic says.Kidbuu55 said:Who said he can't suppress his power?