COMPLICATED!

 A few permutations:

Day 1 winner currently KW unless he moves back into the top 3 in which case if I'm also still in the top 3 PB would take his place - JMg only gets that daily winner spot if the top three are me, KW & PB  

Day 2 CCr will get the daily spot unless she moves back to the leader board in which case it would be TMg taking day 2.

Day 3 TS will win the daily prize unless he makes the top 3 in which case then K will take the daily spot, if they both are in the cash the daily prize will roll to PF 

Day 4 PF is best here and so unless he get into the top 3 or has already won day 3 then he will take day 4's prize if he already has a prize then JMg is next but he also could easily already be collecting either the day 1 or 2 prize so if he is he also can't win day 4 as well so then we roll to 3rd on day 4 which is Vince.

Easy as that!