Here's a some great advice for leaders from Brad about the importance of fixing weaknesses:
AMBITIOUS MANAGERS SHOULD WORK HARDER TO FIX THEIR SERIOUS WEAKNESS(ES) THAN TO BUILD ON THEIR STRENGTHS
Having assessed and coached 6,500 senior managers, my experience tells me you should ignore the common “wisdom” that people should just work to keep their strengths rather than to try to fix their weaknesses. An article in the November, 2007 issue of Training and Development (“The Positive Payoff”) conveys that common viewpoint. It sounds sensible for the world-class miler to run miles and not to try to convert to an event he’d hate and fail at – pole vaulting.
Management requires a lot of skills, many of which are necessary, not just desirable.