Don't know that it matters. By definition, if your low limit stop engages then there will be some slack. I think people with doubles in particular rely on the limit stops more than the index. Of course, if it has too much slack then more of your upshift will be taken up by the slack, and it might not shift well.

But it's not necessarily a problem if it's not under tension when in the small ring. If the thing shifts right, then it's good.