Best Case Scenario:
🤔💭 Theory 😲💡
Trump wins with 60%+ of the vote
DeSantis gets second place, stays in the race and continues to split the never Trump vote
Vivek drops out and endorses Trump
That seems very possible. If he gets third place his campaign is basically over after tonight. He put all his eggs in one basket (Iowa) so if he doesn't have the votes there it's over.