Romney won in the Carolinas and Georgia. I suspect Trump would win South Carolina and Georgia, as would Cruz. I stand by my original comment. Trump would obviously come closer than Cruz, but the net effect on the EC would be the same.
You’re still not getting it. Do the electoral math.
Any Republican would need FL, NC, VA, NM and OH or PA, and NH or NM or NV. Ted Cruz would lose FL and VA. Just the loss of FL (29 EV) alone would force you to win both OH and PA, and NH, and NV. That’s a tall order.