I am still experimenting with a primary motion and seem to go back and forth with leading edge vs trailing edge. In trailing edge it is easy for my thumb to be straight with a pick grip in between pad and side. But in the leading edge picking, the kind I use most frequently, it is hard for my thumb to stay straight with the same pick grip. I see a lot of videos with players having their thumb straight with this grip. How important is it for the thumb to be straight and what is the reason? Anybody?
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I don’t think there’s a wrong way to do it, as long as you’re aware (which you are) that it’s another variable you can control with regards to pick angle.
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Post some photos or everything is too nebulous.
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Here is a short video to illustrate my question. Thanks
It looked to me like your thumb joint is at its two extremes of range. It is odd, but when I think of my thumb as being “straight,” I’d probably put it in the middle of its range of motion, or a bit more extended than that. Yeah, but I don’t know anything about thumbs, but I’ll bet that lots of other people around here do. 
Like Kgk said, thats such a huge difference in your two picking styles lol, but honestly various extremes are how you get a good middle ground.
Can you make a video of the underside of your pick grip? Heres a vid if it helps.
Thanks for posting the video, I will experiment with your approach. I see what you mean about finger motion, when I do that my grip is different.