I have only had one cup of coffee, but I am having trouble following you here.
Let me try again. Below are screenshots I took of this guys pictures. Both of them have distinct marks from where the patent number was ground off of the mold. There are two patterns of marks, both pictured below. The top one has 3 "blocks" that make up the pattern and the bottom one has 4 "blocks." By "block" I mean the continuous rectangular stretches where you can see that a grinder was used on the mold to remove the pat no. Someone removed the pat no in 3 grinds on one molds and 4 grinds in the other, thus producing 3 or 4 "blocks." This confirms that there are two different mold pieces being used to make destroyers.
So every destroyer, or at least the 50 this guy has, comes from one of these two molds. He looked at 50 no patent number destroyers and found one of the two grind patterns on all of them.
The video looked at wing shape. He found that Destroyers with a flat or convex wing fly straighter and that Destroyers with a curved concave wing fly more OS. You can use this information when buying a Destroyer to have a better idea of how it should fly.
The guy who made this video did not say anything about which mold his flat winged Destroyers or his curved winged Destroyers came from. He didn't say: "This yellow Ricky Destroyer has a convex wing and flies straighter. It came from the 3 block mold. My Pink Destroyer with a concave curved wing came from the 4 block mold and flies overstable."
What he did was look at wing shape and then compared how they fly. He said "Here is my Yellow Ricky Destroyer, it has a straight wing. It has some high speed turn and flies far." Then he took another Destroyer and said: "Here's my pink McBeth stamp Destroyer. It has a curved concave wing. Look, it flies super OS and doesn't go as far."
He didn't check to see if either of the two molds produce destroyers with a particular wing shape. He didn't say anything like: "Destroyers made in the 3 block mold have straight wings and Destroyers made in the 4 block mold have curved wings."
The block marks show that there are two different Destroyer molds. We do not have any evidence yet showing any significant differences between the Destroyers that come from the different molds. It's possible that there are, but this video didn't study that. He only looked at the wing shape and how that affected the disc's flight.
Hope my 2nd attempt at an explanation made more sense. Drink more coffee.