Clark was the exact same copy of Keith's "ideal" persona, someone who he hoped he could be but was unable to. He hadn't realised it for a long time and it was only after directly meeting him, did he see the differences.
Act brave to go around and cause trouble? That just wasn't Keith's preferred way of doing things. He'd rather pull strings from the shadows instead of putting himself in danger.
But Clark wasn't like this. He was calculating and manipulative, but that was where it stopped. He preferred to be the center of all action as he was strong and didn't care too much about the negative outcomes.
Just like Keith, he was a guy with regular IQ and it was only now that Keith realised how their way of thinking was different.
