My thoughts are that there were scraps and bits of levels that were left out in AO, and some of these were used in AE.
AE uses the same system as AO, all that's changed really is the speech, the level design, and the creatures allowed to be possessed.
The story wouldn't have been a huge problem: Evil comes back to Abe. So what would OWI need to do? Think of another way that the Glukkons could take over the world. I think it was just a way to keep fans happy until they released MO.
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