Learning how to release the club from the 430 entry spot is absolutely the best way to ultimately learn how to slot the club better on the downswing. If you cannot HIT the ball from the 430 point, your body and brain will never allow you to approach from that spot
There are many reasons a golfer swings over the top and it can be a very difficult thing to solve for many. If you are extreme and cutting across the ball here is a drill to help change your visual of a correct swing plane or entry to impact.
A swing with the correct dynamics of release will put the hands on the club exactly how necessary for the golfer to control and swing the club better. A grip doesn't make a swing- the swing makes the grip.
Acceleration versus Velocity. One is speed that is slowing down. One is a speed that is increasing. The golf ball likes one of these much more than the other,
The "Out Is Down" video I made for my YouTube channel several years still continues to be one of my most watched and now better understood aspects of the swing. Watch this new video supporting the evidence and see how it all works in slow motion.
Ever wondered what type of information you receive from an online lesson? Here is a video lesson I made back in 2014. Lots of excellent ideas for you to work on if your habits match the golfer here.