I would agree that on the Tiger especially, the crew is a HUGE factor in sailing consistently at the top of the fleet.
As an example, Jacques and I have done some tuning sessions with some of the SoCal sailors where we would jump on others Tigers for a race or 2 as crew to help the skippers. Most of the time with us being crews we were able to sail at the top of the fleet no matter who we were sailing with.
And I do still consider myself part of the "crew union", I put in more than enough time at the front end of boats that hopefully I have a life-time membership.