I would have thought that shadowing Rayner would be a cushy number. It’s not as if Rayner is any great thinker, and she’s cocked up enough that she can hardly throw stones at opponents any more.
The more I think about Burnham’s cabinet the more useless and compromised it seems. Louise Haigh can’t be in post for long, for example. One slip up from her and it’s banishment to the backbenches again. I can’t see Streeting hanging around either, but for different reasons - he knows he’s been set up to fail, and failing is not something he can put up with. Better in his mind to plot and showboat.