If it were the case that they didn't have to follow the Style Guide, why would SCEA make a game that masters just about everything else graphically. It's not like the developers sit around and say "You know what would piss people off? If we just flat out made mistakes on uniforms. Let's take the time to get details like scoreboards down just right, but it'll be funny to piss a bunch of posters off!!!" There is a Style Guide, there is information on it that teams themselves do not follow to a tee, and the best thing you personally can do is to e-mail a representative from that team and ask them to change it.