Mentors on the team

[Grim Tuesday]

After the closure of the thread yesterday, I think that there is still a valid discussion to have. I know that the horse has been beaten to death, but we have to remember that with every year more rookies and more users join Chief Delphi. So here is the topic of discussion:

What role should mentors play on the team to best advance the values and goals of FIRST? What role do mentors play on your team and why?

Try and keep the discussion civil and productive, I would hate to see this locked too.