To be leader of the Tory party, there is only a memory of three months. In that 3 months you need 2 of the following 3 properties.
1. Charisma
2. Covertly Incompetent
3. Covertly Evil
Boris fails at 2, but succeeds at 1 and 3. However it's been decided that his time is up.
Rishi is an option, he generally succeeds at all 3 to some level, but isn't a shining light in any.
Truss only has 3, fails at 1 and 2.
Shapps is the same as Truss.
Raab is the same, 3, but no 1 or 2.
Hancock is the same too!
Patel has 2 covered, but not 3. 1 could be argued for, as it's impossible to be literally satan without some pull, so Patel is a candidate.
Reese-mogg has 1 and 2, but fails dismally at 3. Makes him a candidate, though...
After all that, the best way to play the game is to not play the game. So my prediction for PM is Gove, as he started his campaign early by going completely AWOL 3 months ago, so doesn't have to play by the above rules.