I see your point, but looking back we see Bigface in a very different way to Raisin.
In AO, Bigface comes to Abe as he's half-dead in the desert, does some mystic shit and then vanishes.
Throughout the game, that's always how he appears - briefly, and always doing something mystic. He's never named, never speaks, and we never see his face, so he becomes something mysterious to both Abe and the player - we both see him the same way.
He fits perfectly into the game's story because there's very little dialogue and explanation in the game, almost like a folktale.
In MO, Raisin is just there in a cave talking to a bunch of Mudokons. He doesn't appear nearly as ethereal as Bigface does, and all he actually does is sit there and tell us how the plot's going to work.
tl;dr: Bigface works because everything about him is ethereal and mystic; Raisin is just a plot-spouting tree stump.
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