There we go.
And you know, when has there ever been a hugely long serialized story when the creator(s) don't change their minds about things part of the way through? Or develop large chunks not knowing where they're gonna go?
Cell gives validation to Gohan's powers sure, but can't that be enough? Why does he then have to go on and be the main character? I don't think Toriyama ever intended something like that, it sure isn't mentioned anywhere in that link. Gohan's no Goku, who cares that he surpassed him for one moment in one fight. Goku is surpassed by people all the time, and he always surpasses them right back. It's the very nature of his character, he did it for like 80 arcs, what's one more right at the end?