Why couldn't Natsu tell the difference between Gemini and Gray? In episode 58 Natsu encounters Gemini posing as Gray. Wouldn't her smell be different? Or does Gemini have the ability to mimic that too?
Gemini makes exact copies, even the celestial spirits couldnt tell the difference and they are bound by a magic contract. It makes sense that a perfect body copy would smell the same too. It does specifically say its an exact duplicate.