
Ximen Bao |

Long running debate. A search for qinggong will bring forth many threads and many posts over whether the option to replace a class element counts as replacing a class element whether or not you take that option.
I say it doesn't, so you could take qinggong and ki mystic, you just couldn't take the option to replace Diamond Soul/Body or any other Ki Mystic replacements.

Rynjin |

Depending on your GM's interpretation, Qinggong either replaces nothing (after all, EVERY choice is an optional change. A Qinggong Monk could have the exact same powers as a base monk if he wished) or almost everything (After all, it DOES "change" all of them from being a fixed gain into being a bunch of separate choices).
I lean towards the former, but it'll vary from table to table.