Haven't read any of the last few pages but it must boil down to personal issues at home for Colo. Homesick, issues with the wife, whatever. The quotes from Pardew after the QPR game seemed to indicate that he was having a hard time focusing. Don't think Pardew is to blame for this one.
Seems to me like the whole Colo situation has been blown way out of proportion. I hope so anyway.
What sort of 'disagreement' could have lead to him asking to leave, right now, in the midst of a relegation battle?
(Insert Pards boning his wife joke here)