I think that's a fair ranking except Christie. No one who has gone against Trump that hard is going to get enough voter turnout to win. It's the sort of shyt where 10-20% of Trump supporters will WANT Biden to win solely to punish Christie for betraying Trump.
If you pay attention, Christie will stand there, take the heat and by the time he leaves the boo volume turns down, he starts to win a few more claps, and he comes out a little higher than he walked in. Plus, he's a blue state republican and he codes as just center-right and socially centrist. He's not that weak...and the fat jokes aren't gonna last forever. He's a slow boil and it's finally his time to take center stage.