@KoiPond you're over thinking this. If someone had an issue with your character they would have said so!

You are obviously more than welcome to stay, but it's your choice. Just make a decision and we'll go with it. :)

I think having Darren involved is good. He is pretending to be a part of this mission when he only happened to steal the letter, fooling the entire team of who he really is. This unknown variable will add something extra to the story. Perhaps he messes up a part of the mission or perhaps he inadvertently helps them, despite not being an initial recruit. There are a lot of possibilities!