As to why Imoen can be resurrected, I really don't buy the story she is a Bhaal child. Remember its Irenicus who says that and then he gives her soul to his sister while taking the soul of your PC. Then again I have been known to be wrong.
As to the second question perhaps you are mixing Maze with Imprisonment. In Maze the character returns after an alotted time. Imprisonment is permanent unless a release spell is cast. When imprisonment occurs the character image imprisoned disappears from the group.
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