Meh, Sunak's is the Chancellor who has overseen most of the worsening economic landscape. Not all of it is a domestic issue, of course, but it's been mismanaged as poorly as anywhere else.
Truss will probably win - she's held one of the three 'Great Offices of State' and ultimately signed a lot of continuity trade deals that looked unlikely in 2019 that went down well amongst the grassroot support. Having Mogg's backing gives her the widest appeal - remember she actually voted for Remain in 2016 - so she can now pivot both ways.
The rest are in the running mainly to boost their profile and secure a cushy Cabinet role.