He's good, but I'm not sure he's that good. I haven't seen all of Jackie Chan Adventures. Maybe he could've bumped Spike, but that's not a clear call and Spike is helped by the fact that his fighting is played straight as opposed to the more fun & humorous bent of Jackie Chan Adventures.
If the list were bigger, I could see him as a contender for top ten somewhere.
I would suggest that it's not the medium, but the quality of perception and expression, that determines the significance of art. But what would a cartoonist know? -Bill Watterson