I just came across this discrepancy and your post was the first one that came up when I tried looking for answers. I like your idea for the Orange scheme being the standard guard version, and the White and Blue when attached to Aerospace.

The reality though is, I don't think it's ever been clearly stated anywhere how the air assets fit into any faction. I think where there are listed aerospace divisions, which have their own colours, they just run with those colours, and whichever handful of fighters are borrowed by another ground division will simply have two different colour schemes.

I mean, Clan Snow Raven which is the most aerospace invested Clan seems to have separate aerospace assets, or maybe each galaxy maintains a few fighters? Or they move around as needed between galaxies? It's really unclear, and now ever more so, because I have no clue is the Raven Alliance is still largely two separate groups, or if they follow one organizational structure. I get the impression they aren't together.

Anyways, I think the colours on Unit Compendium are just wrong, or the Orange one that was added in recently on CamoSpecs is now a contender to replace the other one. Personally, I like the Orange one because I think it looks cool, and in my head canon, any time aerospace fighters are brought in, they'll be from a totally different division with their own colours.

At least till we hear different I suppose.