What does Spiral ZEtsu has to do with anything? He was just a skin Obito was wearing while rehabilitating. He has Senju DNA on the half of his body, but that's not from Spiral Zetsu. That Zetsu was another being completely, he couldn't affect Obito's MS, otherwise Obito would be pulling Mokuton out of his whole body, not just his right side. 
ANd Kakashi most likely doesn't go blind because of eyes linking.
ANd Kakashi most likely doesn't go blind because of eyes linking.
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