Oh wow. I wasn't expecting Ren to be the one who flips out. Can't blame him though. ^^;; This bald monk in particular seems to be projecting his own worldliness onto Ren and the others; if he valued Kai as a friend he wouldn't have thought of bribing them.
THAT WAS SUCH AN INSULT. WHAT A BASTARD
Edit: sounds very much like he's the one "making use of" Kai's "power". Kai was just chilling and hanging out at the cafe. Here he's being used