The concept images you're referring to were from Hand of Odd.
What you're suggesting is possible, but I doubt it. If they hadn't modelled the disembowelled Elums, they would have had to have modelled something else instead, so it's not that much extra effort to include a little easter egg for the more observant fans.
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Spending as long as I do here, it's easy to forget that Oddworld has actual fans.
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