Doesn't both angel and demons know the "true" worldstones location? And that's the place they've been fighting on all this time? I mean, If I'm not wrong lorewise, they've both held the worldstone in their posession. If Inarius "ninja'd" the worldstone and brought it to sanctuary, he must have known its location.
The Worldstone was apparently only shifted into another dimension, this it never really left Pandemonium. However it's destruction doesn't seem to have returned it to it's previous state there either, though Blizzard has hinted that it might not have been permanently destroyed per se.
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Supporting big shoulderpads and flashy armor since 2004.