you don't understand just how black wesley snipes is...
in blade that was with heavy white makeup and it didn't really work.
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technically it could be. we never see him without his robes or mask.
edit:
not saying he could be 'white' but we don't really know what exactly happened to him physically. we see him as a weird almost phantom like creature and shit but he might actually have taken on a greyish, extremely pale color due to his injuries and 'recovery' from whatever happened prior to overwatch game storyline.