Ok, hydejing’s vague suggestion got me to look at this video again. I didn’t watch the video all the way through the first time and didn’t know the camera angle changed. So I’ve taken another look.
The issues I see are a lack of momentum and a stride direction that is significantly to the glove (i.e. open) side of the target. I also see the glove not being extended out front enough. My suggestions are as follows:
(1) Get your body moving forward sooner. Push your hips sideways towards your target before your knee comes all the way up. This will create more momentum and better timing.
(2) Get your stride foot to plant more inline with your target. In the video, your body goes one direction while your arm tries to throw in a different direction. You want all of the energy created by your momentum to be directed in the same direction that you’re going to throw the ball. You can help make this happen by getting your hips moving in the right direction in (1).
(3) Extend the glove further out front during your stride so that the glove arm extends out front the same distance that the throwing arm extends back (i.e. both arms should be bent the same at the elbows). This will help with timing to allow later shoulder rotation.
The glove doesn’t really swing out to the side as I stated previously and that’s good. The glove does swing behind you but after ball release so, while it’s not in a good position to defend yourself against a come-backer, it won’t affect the pitch. Roger Clemens did this.