Yea I saw it before you deleted it.
Goku more or less dismisses Gohan's chances against Buu. He does have to think about it, but at the end of the day, he's dismissed and it's not really thought of again.
Gohan should be getting within range, but clearly not rivals. Or at least that's how I interpret the scene. Imagine someone telling Goku that nah, he's better off staying away from the battle vs Cell. ( Before the real speed stuff is an issue )
That would be quite ridiculous, Goku was able to put up a pretty decent battle. So, all in all, I think Gohan can't really do that. It's not worth sending him. Goku thinks Gotenks is going to wipe the floor with Buu and Gohan going there wouldn't do anything.