It gets the assests and legal rights and duties.
There's no source that says this is the case, though I could see it being argued in the Grand Council.
All this can be opposed in more Trials of Grievance or Trials of Possession.
Now this I can actually agree with. Whichever Clan Absorbed the Jaguars would inevitably get drowned in Trials of Possession for the right to that invasion corridor, and probably lose out on their best opportunity to capitalize on it.
IMHO the Wars of Grievance which happend after the Great Refusal and the Abjuration of the Nova Cats should have happened before.
Not really, no. The Jaguars were concealing how weak they were and how dire their circumstances were. The Wars of Possession (which is the
actual name of those conflicts, not Wars of Grievance) happened when they were supposed to happen.
Correct.
So why did they not do this?
I already answered this: because they had bigger problems to worry about. The SLDF was on their proverbial doorstep and the other Clans were certainly not wanting to draw the SLDF's ire by getting involved in their Annihilation of the Jaguars.