The other thing is this- the Clans held meetings with folks by remote who were in the Homeworlds, so the bloodname leaving the OZ is a hand-wave matter. I am not sure how it would be addressed now . . . which is probably why it was not in ER3052.
The problem with 'all' the Bloodnamed leaving the OZs is pretty simple . . . its your officer corp. For the frontline Invasion units your galaxy commanders, star colonels and many of the star captains & commanders are bloodnamed. Alpha and Beta even have bloodnamed as regular warriors- its more prestigious to be a line mechwarrior in Alpha than it is to be a star commander in a secondline galaxy- or even in Gamma or Delta. In addition, a mechwarrior was more likely to see action in Alpha or Beta than any other galaxy- and your codex is how you got into the breeding program. To be unblooded & a star colonel in a frontline galaxy you have to be a ristar and an exceptional warrior/commander- Ulric did it waiting for a specific bloodnamed. In secondline and garrison galaxies, in al but rare cases the galaxy commander will have a bloodname, most of the star colonels will (some could be freeborn), and IMO about half the star captains would have bloodnames. Secondline & garrison galaxy star captains and commanders are where trueborn career tracks & bloodhouse politics come into play IMO. We see examples where new ristars are sent to better secondline formations (as stated previously quality between frontline and garrison IMO) to get some command experience while in real combat- its a test to see if the warrior is that good and can run a unit. Perform well, and you could get a shot at a command position in a frontline galaxy- anything else will increase your time in the secondline formation . . . or could result in being kicked down to a garrison galaxy.
We see several different cases, in the Invasion up to 3145, where warriors are given a command position in secondline or garrison as a challenge- 'fix this and you can get a better assignment.'
ANYWAY . . . we really do not have any indication all the frontline clusters headed back to the Home worlds. Ulric Kerensky, Garth Fetladral and Conal Ward traveled back to the Home worlds with their keshiks and maybe a cluster- Ulric had Golden Keshik & 4th Wolf Guards (Ranna, Carew and Evantha's posting), Garth took Silver Keshik and a Beta cluster, and Conal Ward as Loremaster had the Red Keshik and 11th Wolf Guards (Vlad's unit IIRC). The Ghost Bears had their Loremaster for the Invasion in a combat posting IIRC, so its likely the same thing happened- not sure if the Jag Loremaster had a combat posting or was left minding the store in the Home worlds.
For concentration, I think you are right . . . IMO depending on the Clan you are looking at anywhere of 60% (Sharks) to 80% of bloodnamed/ristars being in the frontline clusters (IIRC we have a very few galaxies that mix frontline & secondline clusters outside of Falcons).
AlphaMirage, the Invading Clans are also more likely to have the full bloodcounts than they have had in most of their history- the Invaders Clans reactivated bloodnames that had been reaved or lane dormant for some time. It should also be noted, the Wolves would have had more than the basic Clan count- b/c of 40+3 and absorbed Widowmaker names . . . while the Jaguars could have but left Mongoose alone. Then factor in that you are talking about 4 of the most successful Clans so there is a higher chance of abathka in vs out.
