I'm new at this coaching thing, but I confess I don't see the utility of a 15 minute soliloquy after a game to deconstruct a loss for 3rd and 4th graders. They know they lost the game, and they already feel bad. Two minutes to lift up the bright spots, so they stay motivated. Maybe two more on lessons learned, Socratic style. Then a 1 minute pep talk on how they're a better team for what they've accomplished and learned on the field. Save the rest of the time for something useful, like practice.