As has been posted in this thread earlier osis really painted himself into a corner by demanding help in a public way.
CSJ painted themselves into a corner by their behavior in the Inner Sphere. No other Clan marked itself for such destruction as CSJ had, with their depredations and brutality. No other Clan had proven itself as inept at strategic warfare, time and again, even with victory in sight, holding all the cards, their arrogance denied them victory. What Clan would even consider themselves as allies? CSJ made few friends among the Clans and when they were the most powerful Clan, abused their own civilians at a time when no other Clan would dare stop them. The memories of their bullying would probably never be forgotten.
The Clans are not unified. Their culture has them in constant competition, in constant antagonism. Only are there rare moments of cooperation, and their appearance of a united invasion of the IS was an illusion: They just happened to be heading in the same direction by coincidence.
During the invasion, when a Clan was struggling to advance, the other Clans would gloat, not offer assistance; It is not in their culture to cooperate. Kerensky's legacy was a bitter form of Darwinism that gave the Clans more reasons to kill each other than to preserve one another.
When Osis called for help, if I was a Clanner, I would be razzing him and CSJ without mercy. Osis, leader of the Fundamentalist Smoke Jaguars, the self-styled ultimate Clan warriors, just turned Clan protocols upside down and cried "Uncle!" in front of the people for whom he held contempt. When a Clan screwed up, the last people you asked for help would be the other Clans, because that was just a declaration of being unfit for existence. In that respect, Osis forgot Clan history.
As it was, standing by and watching CSJ being crushed by IS forced was very much a part of Kerensky's legacy: A weak Clan was a detriment to all of the others and a lesson for the future.