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He did straight out say who it was and from what game, although it was implied he made the sprite.Adjustment of palette and some other conversions of shape in terms of outline and such. I promise my next post will be all original... didn't realize I was going to be flamed.
I think you'll quickly find that artists, like most people, hate to have their art stolen or ripped without permission, and are consequentially (and reasonably) provoked when they discover unoriginal art to be claimed original (besides complete rips, this includes minor recolors and/or edits to existing work without giving due credit.) Just be sure to cite the sources for your edits in the future if you're going to post them online (given that you have explicit/implicit permission from the author to publish your edits,) and you won't see such reactions