As a teacher earlier in my career, I thought everything had to be textbook in order to be a really good player. Then I started working with Brendan Steele and he came to me with a really strong grip, so it dramatically changed the way I had been teaching. Great players have all kinds of grips — strong, weak and neutral —but you need to understand the matchups you need to have with regard to your wrists in order to make your grip work optimally for you.
Those with a strong grip need a more extended lead wrist and more body rotation through impact to keep the face square while weaker grip players need a more flexed lead wrist and less body rotation through impact.