What the named Nostra pilot? Hopefully it was Liz.
By 3151 Clan Spirit Cat has been on Marik for 14 years. They have rebuilt to 6 Clusters (1 Provisional) at least, they probably have a generation of sibkos close to graduation. I am not sure why TPTB have kept Rikkard Nova Cat and his Clan in stasis, with regards to bloodnames and the like.
My best guess is that TPTB are waiting to have Kisho show up, so Rikkard and Marik can officially merge their two halves (Nova Cat and Spirit Cat) into a Clan, and start all the bloodname stuff with a clean slate (Declaring all holders not in Clan Protectorate space to be dead, starting bloodright trials, etc.).
Perhaps this will get resolved once the IlClan is declared and Clan Wolf and the Republic merge. There are STILL Nova Cats alive in Fortress Republic, at the very least Paladin Tyrina Drummond is there.