I couldn't kill any of my squadmates regardless of the playthrough though, maybe Jacob..... Maybe you should have let Grunt get carried away by his swarm of fans....
I thought about choosing between Grunt and Garrus alot, but in the end I wanted Grunt to lead the few who were left in holding the line. That way I only lost Mordin.
And this is the first time I've actually played through the suicide mission and had some of the squad die. Kinda felt like I was watching Predator. if only shep had yelled, "Get to the Naahhmandy!"