Face it, frontrunners don’t debate - they don’t have to. And also understand that the best debaters (I, personally, think Cruz is a overly-practised, insincere debater) don’t necessarily win elections. Newt Gingrich, anyone?
Newt was not a great debater. Trump claimed several times that he was anxious to face Ted mano a mano. But surprise! It turns out to be another of Trump’s whoppers. Trump won’t debate him b/c he would be shamed before a national audience. Trump ain’t stupid.