You and I both know exactly why - as I said he was a career baseball pitcher. It's how just about any former baseball player would hold it. Old habits and preferences. But preferences don't make what you think happens in softball games actually happen.
By the way, I see you're still ignoring RAD's perfectly reasonable questions. I wonder why?
Are you going to deny that the person that you just posted a video of that you said "knows what he is talking about" completely told you that your opinion on holding seams was wrong?
You also just said that "about any former baseball player would hold it" with 4 seams, or do just about any former baseball player hold the ball wrong?
The least you could say is that you wrong when it comes to holding a ball with 4 seams.
If you don't think you are wrong, maybe you should go back and rewatch the Dan Blewett video is just shared.