I'm not sure it entirely makes sense, though, since surely some of the people Sam leapt into would've been unwilling to be replaced, most notably Lee Harvey Oswald.
There's no way this makes sense with most of Sam's leaps. No way would any of those people ever have given consent. Indeed, how could they? There's no way they could even have possibly understood what was going on. "Excuse me, I'm a time traveler, mind if I take over your life?" It would be utterly beyond their understanding.
That's why the Swiss Cheesed memory is a ready-made excuse. The leapees will never remember what happened anyway, so once they leap back in...ignorance is bliss.
Magic may be a special case, though...we'll just have to wait and see. Perhaps God/Time/Fate/Al the bartender/Captain Braxton was aware of the role Magic would one day play in the relaunching of Project QL, and thus gave him a special understanding of what was going on?
Questioning the person in the waiting room is fastest way to find Ben.
Is that happening?
Well, you just admitted that with Ben,
there is no waiting room, since (unlike Sam) Ben is leaping into other people's bodies.
That's why I mentioned "Nowhere to Run". It's proof positive that Sam kept his whole body the entire time (Sam leaps in as a veteran with no legs -
yet he can still walk). That episode, by defnition, would not have been possible if Sam was leaping into other bodies like Ben is.
Now we may or may not get an explanation as to WHY the rules are different this time. Why does Ben leap into other bodies when Sam did not? I'd actually like to hear it...