The way I read it is Ki falls into the trope of [url=http://tvtropes.org/pmwiki/pmwiki.php/Main/MaybeMagicMaybeMundane]Might be Magic, Might be Mundane. [/url] Insofar that you can't accomplish anything with it that couldn't be waved away as a feat of strength or skill. Like focusing your ki to enable an especially deadly blow others would just chock up to being an exceptionally lucky or well placed punch.

Also, for what it's worth, I'm going the same route with Taula's 'I draw strength from the skin of powerful beasts' gimmick--but if your bare fisted warrior monk makes the grade I'll probably edit her to use true sympathetic magic instead of just Beowulfing people up. Last thing I want to be doing is horn in on someone else's act.