I have made mention on numerous occasions that I allow the players to run our halftime discussions. One reason I do this is because there are only two basic themes to talk over; 1) who is dangerous to us and 2) who is their weak link? It is the latter of these that takes the forefront when I fill out a line up for my teams. That is, I want a stout back line with no weak links.
As Sun Tzu stated,
Invincibility lies in the defense;
the possibility of victory in the attack.