Takes a pretty special character to be an effective captain at a young age. Cotch was (and remains) a born leader capable of and willing to drive cultural change in an environment that is traditionally resistant to cultural change. And he went about it from day one. That's once in a generation stuff, and we should be wary about appointing another youngster and hoping lightning will strike twice (sorry J Graham).
I don't see another young Cotch waiting in the wings. The next-best candidates are predominantly his contemporaries, and even then there's no obvious standout.
Head says Grimes. Heart says Martin. Either way, I expect the tenure of our next captain to be shorter.