I think CB treats these things more like guidelines. Troopers at 40 points usually have higher ARM, W, BS, or visual mods. Umbra's are light in those areas. Their advantages are slightly different and they make terrible gunfighters in my experience. It's a nice option sure, but i never waste SWC on them to go around shooting. I usually have them doing something else and if they can shoot my opponent along the way, great. So I think an SWC cost of 1 for the spitfire is palatable, not 1.5 as on the Legate. Making one of these Umbra's my Lt does nothing but persuade me to shoot less. The Umbra's need be played in such a way to minimize the risks. Play it smart and gain some wounds first then shoot in relative safety. However, the Samaritan is still a bad gunfighter with BS 12 and no mods whatsoever. I don't think a 0.5 SWC spitfire would be a terrible idea for the Samaritan. The Legate can Cybermask and surprise shot but that's order intensive. Making the Legate 1 SWC would be better, making it 0.5 would be great. My preferred Onyx Lt is the Samaritan Breaker combi.