Well here's the thing. Everyone is acting like ki sensing idiots when Gohan is brought out to fight. This continues on and on. The issue isn't Gohan power or speed, it's always been that he's a kid, doesn't have warrior spirit and is not tough. These flaws seem to blind everyone about his power.
I mean just think how many times Gohan is not given his props.
Let's also look at everyone's reactions to Gohan powering up.
Everyone's face is filled with shock or fear. Everyone except Goku. Sure they didn't expect Gohan to be so powerful, but still, I think that speaks volumes.
The way Cell talks about Gohan is ridiculous.