[quote=@Eisenhorn]
<Snipped quote by Framing A Moose>

Wouldn't that be some culture shock, though, someone used to leading suddenly not being in a leadership position anymore?
[/quote]

Most probably, but the whole reason that the reserves teams exist is so they can join teams who have lost a member. Another reason reserves teams shouldn't have leaders: they have to be ready to be demoted at a moment's notice.