It's a million times faster and less telegraphed. Along with taking no power penalty for bringing it into the front like a jab. Although if it's tkd sparring then you can't kick their thighs with it, which is the best place for sparring.
GSP is not a Taekwondo guy and he still pulled one off
https://www.google.se/imgres?imgurl=https://strikingthoughtssite.files.wordpress.com/2017/11/gsp-side-kick-comp.gif?w=431&imgrefurl=https://strikingthoughtssite.wordpress.com/2017/11/12/michael-bisping-vs-george-st-pierre-the-show-of-wisdom-technical-breakdown/&h=246&w=431&tbnid=bjn7c73rcttbeM&tbnh=169&tbnw=297&vet=1&docid=45fDbr5iil8VxM
It's not more powerful with the lead. Compare throwing a roundhouse kick with your lead leg compared to your rear one. There is a longer rotation - more room for acceleration=more power
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