"Just because someone falls down, it doesn't mean the technique was done correctly. Atemi has often been used to cover up poor execution. "
Actually you missed my subtle point....rather than working with the technique uke decided to lecture me on where my "Ki" was directed. I simply distracted his "Intent" (or Ki or whatever you want to call it) and directed my energy into the throw.
As to the atemi comment, I suppose if one practices Aikido as a dance practice where uke and nage work cooperatively to perfect their "execution" this might be relevant. But I would contend from a martial viewpoint that failure to deliver atemi would consitute poor execution.