I swear its a scam. Most of the companies own the other companies that they distribute under, but a lot has to do with the process in which they're constructed. Ever wonder why the all look the same?
A prime example: Kelly Springfied tire makes, Good Year, Continental, and a ton of other branded and non branded tires in the same plant, same basic materials, just the layering processes are different.
I have the Breyton GTP and Avant has the same exact wheel, just a coinsidence, I doubt it. Breyton is the only one who has it in a 20.
Good luck finding something you like