I got cutoff on the debate too. Going off what I've heard on these threads (Cruz being silenced, Carson a non-factor, Walker sounding stupid on a foreign policy question) then Rand did fine. He didn't hurt himself with anything he said and others who are his competitors for certain blocs of votes did. But Trump isn't a sideshow anymore. He's got to be taken seriously and dealt with in that matter. Rand isn't going to lead in the polls after this debate certainly he can keep himself in the top half of the field.
I also think at some point, the debate stage had to be whittled down to five or six serious candidates, not glory hounds looking for a book deal or talk radio gig. Even 10 is way too many. You can't have a good, quality debate with that many people, it's impossible.