Distance runners often move too fast to develop a long history with a team. There are some exceptions - but by and large, if you are too restrictive, you are going to have a watered-down competition, where few of the top tier runners are involved.
True, organizations such as Team USA California and Tempo Sports are not as tight (and haven't been around as long) as Hansons and some of the others, but they are bona fide groups that train together and often share coaches.
Some athletes are forced to move away from the geographic area (for instance Dan Browne had to move to San Diego for military duty) - does that mean he is no longer allowed to compete with Team USA California ?
James Carney's two team-mates (Dathan and Hartmann) moved to Eugene last year. Does he no longer get to compete with Marathon Performance because he didn't feel like re-locating to another state ? They are all still coached by Brad Hudson.
The lines right now are just gray - and that is the state of our sport.
Rather than tear down and poke holes in those trying to highlight and spotlight the advent of team running, we should all be celebrating it and pushing for it's inclusion in other road races.
The phenomenon of the group and team concept in our sport has really added to the depth the last few years and helped us "close the gap" on the foreigners.