Yeh, like him or loathe him Corbyn is probably going to be pretty important over the next few months so the professionals involved - the MPs etc - really need to bite their tongues and accept that and thereafter see what they can do, and how they can work work him, influence him, persuade him, bribe him, corral him or even trick him, into scuppering Brexit.
Maintaining the 'purity' of your anti-Corbynism is not going to help anyone.