As important as it is to know the weaknesses of your team members, it is much more important to know and utilize their strengths.
Any successful coach doesn’t position his players where each will do the least amount of harm; he places them where they’ll each do their best. Great pitchers or quarterbacks don’t play those positions because they’re not as good at hitting or catching a ball; they play these because it’s what they’re best at.
Know your team. Know their strengths, their skills, their virtues. Focus on developing these through regular disciplined practice guided by short-term and long-term plans for improvement. Do so, and you’ll build a better team, a skilled team, and not just a team that’s not as bad as they once were.