Whether Raffo approves or not, will it change anybody's opinion about the job Byrne did and about Cohen?
He doesn't need to explain anything. Maybe he does hold a grudge. He might HATE Cohen now. If he does, to expect him to come out and make a statement to in support of a program that didn't even hire him, just to smooth things over, would be foolish. If he has no ill will, again, what does it matter if he says something publicly? We don't need his approval, he doesn't owe us anything either.
I've also gotten the feeling that Raffo never was seriously considered. He may have been interviewed just to control Polk as much as possible during the search, which didn't seem to work out to well as evidenced by the fact he tried to strong arm candidates away from the job.