Wow, I go to bed and come back to the beginnings of a bandwagon vote on me. Sorry for lurking, I've barely had any time to even read what's been going on. My schedule will clear up a little over the next few days, so I'll be a little more active.
As for the thing with Drake, we have Drake claiming to be the Dustbringer. If that's the case, then pardoning him would be the best plan, if only to keep track of that spren. Of course, he might be Unjust, but that could be easily discovered if he ever uses his abilities. If we kill him, we give the Unjust another chance to become Dustbringer, but we gain information.
These facts leave me undecided on what to do. Leaving Drake in jail, however, doesn't seem to be a good option. I'm currently undecided. I'll make a decision when I have some time to think about it.