Sorry, didn't quite mean to submit there.
TKD is a very specialized sport art. Very limited engagement rules and a complete lack of tools for dealing with anything but an upright, sparring style opponent relegate it to at best a functional niche limited to kicking (which any well rounded martial artist can convert into a different engagement, ground for instance) in the course of which instantly defanging most of the TKD stylists tools. TL;DR, TKD is more of a sport than a martial art. I should know; I'm dan-ranked in it within the context of the Korean taekwondo jidokwan, one of the earlier kwans that preceded the establishment of the WTF and ITF collaboration / standardizations.
Chan's martial arts background spans several styles (Shaolin gongfu, taekwondo, and hapkido), and consequently is broadly based with ground, standup, upright grappling, locking, striking, blocking, kicking, footwork and defensive components. He is by *any* sane measure a much more well rounded martial artist than Norris (and if you just admire kicking skill, I'm surprised you didn't bring up Bill "superfoot" Wallace.)
Li started training at age 8. He won his first national championship at age 11 -- remember we're talking about China here -- he traveled to more than 45 countries as a member of the Beijing wushu team. He held the title of All-Around National Wushu Champion from 1974 to 1979. He trained in internal and external styles, as well as the (then) required shíba ban bingqi (eighteen arms or weapons.)
(Please excuse the mangled pinyin; I don't use pinyin much, preferring actual hanzi, and traditional hanzi at that. (hanja for you TKD folks.) But slashdot doesn't support them (why? some geek site, lol)
Further, he practices wushu, which looks cool but is not a very effective martial art.
Wushu means "martial art." It doesn't tell you squat about martial art effectiveness, other than that the practitioner, like a "martial artist" in the US, practices some martial art or arts. You should have a look right here so next time you use the term wushu in the context of a Chinese martial artist, you actually know what you're saying. Although, technically speaking, just like gongfu (doesn't really mean martial art at all), the term carries implications you might not initially grasp; for instance, to a Chinese, a Korean TKD master is both a gongfu and a wushu master, plain and simple. Which again demonstrates that wushu doesn't mean anything even close to what you thought it meant.
However, your previous statement is worse in that it amounts to a blanket dismissal of all of China's martial arts, which is nothing short of ludicrous. Combined with your bewilderment of both Chan and Li's training backgrounds, your credibility is somewhere south of zero on this matter.