They talked about it quite a bit on the local radio shows at the time. KW was extremely upset at the Utah AD - to the point that they thought if he had an offer right then he might've left himself. At least that's what PK was hinting at - and he's been friends with KW for a long time.
But the story is that Kalani left Utah because the Utah AD wouldn't extend or increase his contract. The actual details were never shared - just lots of hints about Kalani leaving, it being due to the AD and contract issues, and KW being pissed.