I have a feeling that he knows that no-one involved in the negotiations has a cat in hell's chance of coming out looking good and that he knows he's politically better off just letting the Tories screw it up, which they will. It's way too late now but we needed a credible opposition to brexit. there was simply no-one on the high ground telling us the truth bar the limp-mode LibDems, and the pro-brexit lies had one hundred percent of the populist appeal. By proceeding in the Labour Party's best interest, he's not acting in the country's best interests. But if he tried to be honest and speak out in the country's interests he'd be demolished. What a cock-up. Positively Kafkaesque.