I know how that goes. Before I got here my boys were in some pretty serious trouble, we're talking... serious trouble, deals with the devil kind of serious.
But then I wind up here, and human, and they're already here, they've already been here for a while, and don't remember some of the stuff I do. So... they're still my boys, just from somewhere earlier in the timeline, so it's almost the same thing, but just almost.
I still worry about my boys, back home without me to look out for them, for all I know everything finally caught up with them.
Basically what I'm saying is that yeah, your friends will probably get here in their own time, sooner or later, they may even be the right ones, but even so that nagging 'what if?' feeling? It's never going to go away, best you can do is learn to work with it.