If SAO was focused on Klein it would have been alot better. It could have been about him and his friends forming a guild, and it would show how he lost some of his friends along the way (pic related). Kirito still could have been there, he would have just been that 'mysterious, powerful' character that shows up from time to time to help Klein.
Of course, this would have meant that the first season wouldn't have ended like it did. Add some feud between his guild and the other main guild, and have them go all the way to the top floor for the final reveal. Kirito wouldn't save the day either, it'd be everyone working together like it originally should have been.
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Wow that sounds pretty cool, and I never made that connection with the pics. One thing I wouldn't like about that is you lose cool characters like Yui and Asuna, and Klein isn't all that powerful, so the fights wouldn't be that cool. Also we know that Kirito and Asuna did most of the work when it comes o clearing the bosses. It would be cool to get a spinoff show that follows Klein during SAO though, sort of like how FMA: Brotherhood retells their story and expands on it.