The blem-ness of these discs is variable. It is difficult to find any flaw in the Katana. The Wraith has some deformity under the nose, but only on one side of the disc. The nose on the opposite side looks fine. It is almost as if the ring piece of the mold wasn't seated properly, and got slightly tweaked or bent out of shape.
Regarding the process, I've had some thoughts, and I think this process can be enlightening with regard to the mechanics of injection molding of discs. I imagine that they usually would press out any air bubbles that result from melting the pellets, before injection into the mold. In the Blizzard case, they manage to get air into it, but it is distributed in small bubbles, and they seem to have some sort of control on bubble sizes (the blems were experiments). Getting a frothy mixture of air and molten plastic with uniform small bubbles is probably very difficult to do just by mixing air and plastic pellets together. But, there is another way...I'm going to make a wild guess that maybe the bubbles are created by some sort of additive in the plastic itself that generates gases during injection (perhaps triggered by the decompression that occurs once the plastic enters the mold). For example, they could produce the plastic in a high pressure CO2 chamber, and the gases would dissolve into the plastic itself. This would produce a more uniform bubble distribution since the bubbles are exsolving internally from the plastic itself. The degree to which the bubbles are stretched (elliptical vs. spherical) is an indication of how far the bubbles were transported (stretched) in the injected plastic from the point where they initially exsolved (they should always begin spherical) and/or past the critical point where the plastic rheology is soft enough to relax deformed shapes back to spherical (owing to surface tension).
Drivers: Starlite Wraith (158g), Gummy Champion Leopard (150g), 1st Run Z-Talon (150g)
Mid-Range: Star Classic Roc (146g), R-Pro Roc (157g)
Putt/Approach: Legacy Protege Clozer (158g), Glow DX Aviar (150g)