As a candidate, you have a number of choices -
You can concentrate on advising how Jeremy was cheated, and how wonderful he and his policies are - which gives you a shoe-in with the 'top-end' where the actual choice of leader will be made.
You can confirm that the Party is full of 'returning' to a fantasy vision of the UK that only ever existed in the febrile imaginations of the Islington Set - and vow to return to reality - which will gain you the respect and support of the entire electorate, but it won't matter because the aforementioned 'top end' will scupper you instantly.
Or you can pick on a current thorny issue, make it look like you are in touch with reality, when in fact the electorate cares far less than the media you are courting with the issue gaining you considerable air-time and column inches, while simultaneously making you look like an attention-seeking numpty who has been living on Mars for the last year or so.
Mr Johnson appears to have opted for the latter, and added a few stones of his own to his pockets, to those placed by the PLP, and is ready to be thrown into the Thames and sink without trace.