[Bongle]

The defensive question is easy: can you pick a robot that can consistently prevent more points than it can score?

Let's say the 3rd robot will be a 40-50pt/match robot, with 28 of those points being 3 discs + a 10pt hang that you're going to get anyway. So that means the choice between telling this robot to defend or not comes down to whether you think the robot can stop an enemy from scoring 22 points in 2 minutes, while not fouling itself. I think that's right on the limit - that's slowing someone down to the tune of 2 cycles, or blocking/delaying 7-8 shots from a FCS. You'd need good scouting about your opponent's average score rate to figure out if a defend/offend decision is working out.

If the 3rd robot is a 60-70pt/match robot, then the decision becomes much harder.

Also, points per match is another tough metric to use: if, between the other two robots, you actually score all the discs, then your 3rd robot's 60-70pt/match credentials mean nothing.