@nprofile1q... Is Burnham even the least-bad candidate? He's the only candidate who's put himself forwards so far but he's given no reason to think he'd be a noticeable improvement over Starmer.
Streeting would unquestionably be worse if he ran (he might as well not bother though). Miliband has been listed as a possibility and while he has problems I don't see that he's any worse than Burnham. Ditto Rayner.
I see so many people (especially on Bluesky) fawning over Burnham though. (And it's not even guaranteed that he's eligible as a candidate yet!)