if that was true that power of gohan wouldn't have affected him so much.
I believe he has more stamina & endurance.
Silver Surfer would defeat him and most other cosmics as well that are not nigh omnipotent.
look what he did to amazo
and look this feat of durability :
surviving the ground zero destruction:
turning ray blast into confeti , those ki blast would look ridiculous:
and before cell attacks the ring will detect it :