Carr can do roll-outs with single and two-stacked reads. He's done many this season. I'm not sure why you guys are suggesting he can't.
Rattler wasn't out there scrambling like crazy and making guys miss. He had a few good scrambles up the middle for relatively short gains, but I did not see a guy who is going to win games with his athleticism. He's going to need to develop into a passer who can take advantage of his big arm.