I'd always assumed a proper introduction would have been included in Munch's Oddysee, but like many things was excluded. I don't happen to know what that introduction is. The Raisin was created when OWI liked the look of a design, and not the other way around - hence the Raisin wouldn't have appeared in Lorne's original plots. But that's all I know.
Just remember that at the end of AE, the Weirdos told Abe that he'd know all about Queen Sam when he met Munch. Maybe Abe learnt of the Raisin and seeked him out, asked of Munch and that's where we join in. Or maybe there's an interesting story between the two times, which would make a great third Abe game in the future.
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