How would that work? On a normal debate, with both Cruz and Trump present, the Cruz people would be gushing over everything Cruz says. The Trump people would be gushing over everything Trump says.
Since Trump isn't there, it will be Cruz people doing their usual thing, and the Trump people deriding everything Cruz says.
It's pretty much just a p*ssing match.
There used to be a good running commentary of these things. Oh well. New era, I suppose.