I think this is spot on. I have seen 30 person teams composed of 30 one dimensional people, and 3 person teams composed of 10 dimensional people. With few communication barriers and everyone thinking about everything all the time, I take the small tight team. It does depend on the project, though, because a) sometimes the problems can be parallelized and many people working is good and b) 10 dimensional people don't typically like boring problems.