Of course, in the end, I decided to make the trek backwards and check on the nuke set to blow Saren's Krogan army back to hell. I had fit Kaidan into my party throughout the entire game, but I didn't know I'd be forced to finish with Rex instead. I guess I'm more concerned with whether or not I'll still get the achievement for using Alenko through my first playthrough.
Honestly, I just chose Alenko because he was one of the first party members I encountered. I know that's boring, but whatever, I'm going to play through again with different party memebers for different achievements, but even so, I hated leaving someone behind. Is my connection to Alenko and my feeling of loss directly connected to my experiences with the character over the course of the plot or my experience as the hero, Shephard? Do I really care about Alenko or do I care about my record as the commander?
I'd have to say it's more about me than him. Kaidan was a good fighter, but I did feel like I did a little too much hand holding and I think I miss the equipment Alenko died wearing more than I miss his skills as a fighter. It didn't help Alenko that his stories were boring and his voice actor was just kind of bland.
I'm on my way through to the end though. Ilos looms in the distance, and the events on Virmire only make me wonder if I'll be losing another team mate soon.