The TL;DR is this: I found Sydney.

Kevin, old and wise as he is, came up with a secret backup plan. In case everything went to shit, he had a tracker with him that he could activate.

Why did he only tell me? Well, in addition to the fact that I am remarkably trustworthy and good at keeping secrets — a fact many of you know, but I won't say more — he was worried about Mary.

We didn't know exactly what she could do, mind-wise. And Kevin didn't want her to pry his plan from any of your brains. But I was left behind, and thus, safe.

Anyway, the tracker went live, so I know where he is. Let's get to work, kids.