There is no substitute for highly skilled and experienced guard play.*
When you have multiple guards with those qualities, you can be really dangerous.
Not to neglect the rest of the roster, but when the crap hits the fan, you just need to have a guy who you can put the ball in his hands, and he can make a play. The more, the better(I'm putting the max at 3).
*Unless you have 2 5* FR frontcourt players, and even then, we were good, but not great.