It's in the nature of officers to ALWAYS kow tow to the guy of higher rank. That's why their testimony about each other probably should not be allowed in court.
When in doubt, accuse him of lying.
If Maj. Coerr had seen the Col. do something that warranted the charge of war crimes, he would have said so. If he had seen something and wanted to keep it quiet, he wouldn't have been so stupid as to issue such a glowing statement. Why would he call him a "hero", when he could have just said "he's a good officer".
But all of this is beside the point. The special investigations branch of the British Army cleared him, and the case is closed.