[@Klomster] How is that not exactly what Oskar is? He's a vanilla human. I mean, he looks like he's had some cyber modifications, but that's not uncommon in 40k. Plus, with how he's been interacting with the other prisoners already, I'd say he shows quite a charismatic demeanor.

Also, Oskar and Zuriel are only 'small' in the literal sense. One has years of training and battlefield experience among the guard, while the other is a tech priest with enough skill to hack Imperial battle ship systems, in addition to psyker powers at least potent enough to let him turn his entire body to sentient mist. Sure, in a fist fight, the astartes would probably win. However, at any point either of the two are fist fighting a space marine, things are already profoundly fucked up.

I get your point, the group doesn't have a traditional 'skill monkey'... but we don't need one. Unless I'm just blatantly unaware of something, apart from medical abilities, there's nothing I can think of we'd need done that someone in the group can't accomplish.
If I Am blatantly unaware of something, by all means, let me know.

That said, before anyone says it; No, I have no interest in portraying the part of Dave Jimson, Officer of the Estate Imperium, designated buerocrat 146-295/B, in charge of filing expense claims and reports for the galley of Imperial Naval Vessel 254-769-2065, "Macharius' Pride."