So long as Trump decides to stay in the race the other candidates will remain background, unless a Chris Christy steps in. There is a confidence factor that just is not there among the others no matter the imitations of it. Sarah had it but she has been distracted and has somewhat mellowed with family interests becoming politically disjointed in various activities, which is not a plan.
Trump takes his lead from the others. When they project on an issue, so will Trump, and he will take it to the ends of the earth to make an arguement making us forget who brought it up. ha!!