Yes, TTT, I like that one, too!
Like most people, I don't believe Labour has a hope of a general election win with Mr Corbyn in charge, but I would totally support him in taking legal action, if he is somehow conned out of his post by NEC shenanigans. Words mean what they mean and there is not even the merest hint in the rules that an incumbent needs nominations.
Unlike your "Tracy", he was voted in by the Labour party membership, whereas she was selected by only some of the parliamentary Tory party. Are we headed for an outcry of "Bottler May"?