We know knocking knuckles is just incorrect based on all the information we have now about contact point and positions of power inside of the wrists when hitting. The Box Grip, where you line up the knockers with the punching knuckles is what we have taught for years. And while it is more correct and widely used in the MLB, there may be a better way. Some bats, purposely line up the knocking knuckles, you know the main bat company I'm speaking about. In my opinion, and during testing phases, bats with grips that promote knocking knuckle alignment seemed to actually PREVENT the wrist flexion and supination of the bottom hand wrist that is present in the highest level hitters (don't worry, I’ll write more about that later).
Here are examples of grips we spoke about above: