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Why would Abe get tired possessing Lulu when he had no trouble possessing the three Glukkons in Exoddus? And I read somewhere Abe could possess Slogs? 
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Abe only possesses Slogs in MO, he can't in the other two games.
At the end of MO, in the good ending, Abe has been possessing Lulu for an unknown amount of time, presumably from when he ordered the Slig to go to the auction until they arrived and entered the auction. Near the end of the auction, Abe lost control of Lulu a couple of times, as he was becoming tired from his exertions.
This was probably done for realism, and also in AO/AE unless you were messing about, Abe didn't possess anything to especially long periods of time.