Just off of the top of my head:
Trump 25
Cruz 20
Rubio 20
Kasich 16
Carson 12
Everybody else 7
This is probably wrong. The numbers, I mean. But I think that the basic idea – Trump falling behind but ending ahead, Cruz and Rubio battling it out for second place, Kasich at a high-water mark, Carson fading, and everybody else getting their coats on – is sound enough. Bear in mind: if Trump comes in second his campaign will definitely start to death spiral. If Rubio comes in ahead of Cruz Ted Cruz is not actually in trouble, because Iowa and New Hampshire rarely agree with each other. Kasich would need to win New Hampshire before we’d all stop writing off his campaign. And so on.
Also bear in mind: nobody knows jack about what’s going to actually happen next week. We’re mostly just good at sounding confident. Largely because there’s never a penalty for failure. I mean, look at me: I told everybody that Trump would either win or be in fourth place, and guess what happened?