.... is very upsetting to me when I see what "I" consider very poor advice being given to young players who are putting their heart and soul into trying to get better.
This player has some of the better throwing mechanics that I've seen on this website. And probably has the best physical ability that I've seen on this website (arm action, external-internal rotation, intent to throw).
If what I see is a result of "curling the glove toward your body" then keep doing it. curling the glove in itself is not a significant factor but if it results in the symmetry between throwing-glove arm then keep doing it.
My opinion is that this is poor advice because this player exhibits very good throwing-glove arm symmetry, i.e. the throwing arm and the glove arm mirror each other which is a characteristics of high-level throwing mechanics.
Again more poor vice, my opinion. The purpose of the leg lift is to prepare the body to throw. Ideally the leg lift does two things it helps to load the core of the body. Also if done properly it creates momentum which then can be used as the player goes into foot plant. But the key here is that you have to take the momentum out of that leg before foot plant i.e. land softly i.e. landing softly is the same as taking the momentum are the front leg and transferring it upwards.
As stated this is very poor advice. Nolan Ryan took a rocker step backwards in preparation to throw. Most high-level players take a step either backward to the side ( first base side for a right-handed thrower). My advice is to keep doing what you're doing. As far as keeping the weight on your release leg, I don't think so. In actuality what you want to do is you want to lead with the hip and allow the hip to move out from under the upper body. Also known as keeping your weight back. But the only thing that you keep back is an attempt to keep the shoulders from getting too far ahead ( rushing).
My question is "helps what"? If you look at high level (hard throwers) many of them are exceptionally quick from handbrake to release of the ball. Again this has to do with loading and unloading specifically the upper body. Separating the hands sooner potentially leads to dragging and/or inefficient use of the loading and unloading process.
Disagree ( so what else is new?). Hard throwers create horizontal abduction ( pinching if you will) of the shoulders. This creates not only loading of the upper body but also adds extended range of motion. As the ball is being released you want to do just the opposite i.e. what is technically called horizontal abduction whereby you pinch the shoulder blades forwards ( the opposite of pinching them backwards). This pulling of the shoulder blades back together again creates additional rotation of the shoulder joint which is important for creating whip effect. Attempting to pull the chest to the glove has the real danger of creating a linear pitcher.
I hate the word stability as it implies doing nothing. Throwing hard is a violent action. There must be controlled violence in what the lead arm doing because the lead arm contributes to developing usable momentum. I don't see any problem with this players lead down action. Basically you want to think of it as a spinning action of the upper body in that the path of movement of the lead arm clears the way for the throwing arm, i.e. moves in the same plane as the rotation of the upper body.
Where I see this player has the ability to create significant improvement is in developing better rotation of the hips as he is going into foot plant. Currently he is leaping into foot plant which creates more of a catapulting (somersaulting) action of the upper body. Catapulting does not create the same rotational momentum as rotating around the front hip joint. One of the best examples of good rotation around the front hip joint can be seen in the player who posted as bballboy24. and if you look at hard throwing pitchers such as Pedro Martinez, Tim Lincecum, Justin Verlander, Zumaya, etc, they are heading towards first-base after they release the ball which is an indication of rotation around the front hip joint as opposed to catapulting toward home plate.
Velocity and movement are a result of creating whipping effect. Whipping effect is created by explosive rotation of the shoulders around the spine causing harm to act like a whip. Both strength and mechanics are required to create this whipping effect. mdorioles13 has much of this in place what is lacking is developing greater usable rotation into foot plant as opposed to leaping into foot plant.
And just for the record it is also my OPINION that Asjdfromfla is a pompous a** who, from what I've observed in his posts, places far greater value on protecting his private little sandbox (this forum) i.e. places far greater value on "form" (his incessant attempts at "cleverness") but has added very little substance (actual information that will help a player) to these discussions as demonstrated by his response to my post in the above thread.
And as with all posts on these websites simply my opinions.....