By over-playing the role of cornerstone, you may fail to recognize when other members of the coalition have effectively edged you out or moved on without you. A failure to realize you are leading an army of one could be not only embarrassing but devastating to your negotiation position, and it's a development you definitely don't want to learn from your adversary. Although potentially fruitful time commitments, coalitions, nonetheless, require careful management to stay on target and remain effective.