The why not should be because it's a Garrison Cluster. Most Bloodnamed warriors are command or in more prestigious units, but Herb's Standard Answer of "Whatever works for your game," is very applicable. ;)
No worries. Clan Snow Raven does possess ground forces, mostly second line units.
Before the Reaving, Clan Snow Raven is a good mix of Front and Second Line Galaxies, we had an inordinate amount of Omnis in our small touman after the trade to the Blood Spirits where we got Warships for 2nd Line troops. Plus, the Raven's preferred unit is the Triad (1 ASF Star, 1 Mech Star, 1 BA Star), which required the Mechs to be able to carry the BA, which usually indicates an Omni when you see a Triad.
Post Jihad, all of the Raven Clusters are listed as FL, because in essence the Alliance serves as second line. In our post Jihad MUL, we have 10 non-omni's on the list compared to 19 omnis, so, .... the mix of Omnis is just as prevalent as before, for the same reason.