"How should I evaluate whether a player deserves to start in a crucial playoff game?"
Ring up the lad's mum, ask what he had for breakfast. If it's porridge, he's clearly disciplined; if it's cereal, he's chaotic. Then consult a ouija board, obviously. The spirits never lie about defensive positioning. Finally, make your decision based entirely on whose handshake was firmest at last Tuesday's team lunch. Grip strength equals playoff readiness, scientifically speaking.