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I don't have experience with that particular replacer (I usually use https://www.nexusmods.com/skyrimspecialedition/mods/59975 , bonus that it keeps his scars), but it sounds like you have something else screwing with his textures. The Addon won't mess with anything appearance wise, and it's AMAZING. the main thing is if the replacer isn't patched, the drinking patch won't work right. But that one^^^ is patched.