Pardon my intrusion, but since this is the Jade Falcon thread...
I've just reread the Jade Phoenix trilogy, and Ter Roshak spends a good bit of it obsessing over his former commander Roman Mattlov to an unhealthy degree... I decided to take a look at Sarna to see if Roman Mattlov himself might actually appear in fiction anywhere, and discovered in the process that FM: Crusader Clans apparently cites Mattlov as an Elemental-exclusive Bloodname post-REVIVAL, while Roman Mattlov is assuredly a 'MechWarrior in Ter Roshak's recollections.
I figure the simplest explanation would be that the Mattlov name became Elemental-exclusive between the spawning of Roman's sibko and the end of REVIVAL, with its last MechWarrior Bloodrights falling inactive? That seems a bit strange to me, but I suppose it could have been a result of the Clan's casualties during the invasion. Do you know of anything firmer than supposition that might be used to back that up?
(Honestly, cross-phenotype bloodlines confuse me in general, because Elementals and Aerospace Pilots are each so specialized that I can't imagine them being able to share much genetic material with any line from outside their phenotype without diluting the advantages of their heavy selective breeding, but that question's beyond the scope of this thread.)