The two big mistakes that Keir Starmer - not Sue Gray, not Morgan McSweeney - is trying to fix are a) just do the headcount, lads, they're increasing the number of Downing Street advisors b) and realising you can't have a split administrative/political chief of staff, you need to do both.

Reasons why it might not work: well, it's wholly possible that McSweeney can't do the administrative stuff, and also I think shouldn't undersell (read @samfr's Substack!) the important of 'Keir Starmer's Lack of Politics' as a cause of dysfunction.