Power gaming is crunching the numbers to min/Max your character. So asking for a comrade that negates your weaknesses is power gaming. While not all meta-gaming is power gaming it can be used to do so.
Of course your going to know who is more capable in you squad. But intentionly throwing the less capable in harms way is not realistic no matter how grimdark and if your doing that you should be making corruption test as you fall to chaos.
I spent six years in the infantry and there where less capable infantrymen in real life too. No fellow infantrymen would intentionly put that person at greater harm though because of it. When I was a squad leader I would have gladly stepped in the line of fire to protect my weakest man. Unless you've been to combat you wont understand that bond.
Now I'm not saying that playing that way is wrong. Its a roleplaying game and you should play however is fun for you.
Admittedly I'm probably taking it a little personal because of my life experiences and I apologize for that. This'll be my last post on the subject as this got way derailed.