It's not just about policy. Justin's got the perfect family photos. Kenney doesn't. Raitt and Wall don't speak French AFAIK. Leitch sounds weird. Women have a harder time as leaders.
Just to argue with myself here, I think Raitt sounds reasonable if she could be taught a bit of franglais. Kenney is excellent, too. I'm surprised Moore bowed out because, like O'Toole, he's one of the least annoying Conservatives going and has wider appeal. Another possibility would be Rempel who is an excellent debater.