1. Gohan's anger clouded his mind and it resulted in him not being able to kill Buu .
2. It's not mystic saiyin gohan it's just mystic gohan . humans can have the same form .
3. Buu was just playing around when he faught Goku . He didn't come close to winning at all .
4. the transformation to mystic form wasn't complete so gohan didn't have enough power .
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