Actually, correct me if I'm wrong, but Jad's edit has more force because he builds up the 'coil', which gives the 'snap' more emphasis.
I've not done any animation, so I'm not sure how to set it up (also are there timings for each frame?), but I'd love to see how things would change if frame 3 of the original animation

was replaced with frame 4 of Jad's.
If someone would humour me, I'd be intrigued to see if there's any merit to my observation.
On second thoughts perhaps without the extra frames, the kick itself (fully extended) will end up being too quick...