I don't know why people think there couldn't be a mainline Straxus figure, considering that:
-this one has comic book shading, which is a deco choice they seem to use intentionally to have as "premium" separate from mainline
-they practically belaboured the fact that Straxus has alternate colour schemes, in the stream. This was definitely an intentional hint.
-The figure has extensive retooling, which isn't something that usually stays limited subline exclusive for long
-this is an online, Pulse exclusive. Not even fanstream. It's practically begging for another release down the line
-they're already moving in a direction of rereleasing some figures with slight remolds and colour tweaks, and sometimes it's even telegraphed ahead of time through deco use.
I'm betting we'll get a release with a darker, more muted blue, and possibly slightly less red, down the road somewhere. We've had equally, or even more obscure characters released in the last few years.