Honestly, there is little to gain for anyone, and Trump has the most to lose. If he falls under polled expectations a second time in a row, confidence outside of his core believers will be rattled, and the media will go in for the attack. He HAS to top 37 pct, or else he has issues he didn't need.
Delegate counts are immaterial at this point. What we are dealing with is an overcrowded field and a lot of jockeying for position.
It’s an endurance run right now for Trump, Cruz, and Rubio. They bought their tickets to South Carolina with their finishes in Iowa. New Hampshire is just avoiding the tackles as the lower tier throws themselves at the leaders.
If they can avoid any trouble, the crowd thins further still, and South Carolina becomes a battle that will leave another few bodies on the ground.
Then the remaining two or three move to Super Tuesday and we will see if there is a clear winner by early March.