Yes, although I suppose its possible to draw some parallels with Corbyn, who wasnt exactly accused of initially standing with the intention of winning, or in his case of even building something for the future.
Stewart may also only be interested in this sort of party politics and debate if he can get somewhere using his particular form of 'realism'. I suppose this sort of realism actually offers a vast landscape of different policy options, different ways to sell out to various interests etc, but it does limit the flavours of rhetoric and propaganda that you have available to you. It appears he can still talk for eternity using the remaining rhetorical devices, but whether such messages will ever resonate with the tory party is another matter. Given that I've seen him get rather excited about the political crisis that Brexit has generated, perhaps he thinks this situation is a good test for this form of realism too.