Which Gohan was Vegeta talking about?

[Evil Vegeta]

It's to point out that they must be fighting beyond Super Saiyan to bring about that much energy to begin with. It's a direct answer to Kaioshin's question on why the energy meter filled up as fast as it did.

 

[Dioxide]

He was merely explaining why the damage was so large which was the amount damage energy accumulated from their fight. You are putting too much stress on the matter