You're right. OSI will not aid TAZ if they ruffle the Gallic Crown's feathers enough for the Crown to go after them in force. This is for a few reasons:
1. We're not a military and our security division is no match for the Gallics.
2. Throwing our assets at the Gallics would be throwing them away and thus endangering the lives of Zoners in other parts of Sirius as we'd not be able to serve them.
3. We're not going to fight a war that another group, Zoner or not, started for petty reasons.
Zoner solidarity can not truly exist. The swath of space that the Zoner community covers make it all but impossible for one single entity to manage any type of diplomatic stability. Contrary to in game play, Zoners are a very small faction. Why would the Zoners of Freeport 9 send a 1/4 of their population to help defend Freeport 10? They'd be sacrificing their own protection.
Very clear divisions exist because we're all Zoners for different reasons. Some Zoners do not dislike the houses, they merely don't wish to be subject to their whims. Some abhor the houses. Others, like those on 14, even dislike other Zoners.
Solidarity can come, but that means it comes under a banner and means that certain freedoms would have to be given up by the individual. Many Zoners are in the fringe because they prefer individual freedom over the way houses do it.
There is some solidarity, but very local. At least I've seen it. Omega-49? SCRA threatened the system. What happened? OSI leveraged its relations to get the fleet to leave. Trog and the SEF were there ready to fight should the need be. Victor asked them to not instigate and they complied. Freeport 1 sent aid.
The difference is that the threat was aimed at something all Zoners hold dear, not at a specific Zoner or group of Zoners. If we all reacted to what happened to each little Zoner group - we'd all eventually start being treated as one group by the houses and other groups. That is how it was under the CoZ and the ZA.