How to grip a bat?

Just when you think you know something is true, someone or something comes along and tells you that it is not. I have been operating under the notion that kids should grip the bat with their "knocking knuckles lined up" which allows the wrists to roll at contact promoting a good whip in your swing. Don Mattingly has an entire line of bats designed to promote that grip by using a v-grip.

Turns out that much like "back elbow up" or "squish the bug" this might be a widely help opinion but far from the gospel truth.

An oft repeated piece of advice I have found in my searches is that if your arms form a comfortable V-shape and the bat rests comfortably in your fingers - not in your palms - that is more important than the alignment of your knuckles. Whether or not the knuckles line up is not critical but you do want to be palm-up/palm-down at contact. 

I have never been a fan of anything that is a one-size-fits-all and believe that every player is different. Being comfortable and focused at the plate seems more critical than the precise  alignment of a players knuckles.