Metal outstats his copying ability allows them to take whatever make cells abilities like.
His zenki boost and regeneration so even if he could grow past metal it's unlikely that he would be able to utilize it plus like he copied eggman in neo he could get all of his fighting styles making his skill advantage irrelevant
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u/DatKidZ364 The Traveler vs Nier 📖🗡️ 19d ago
Metal Sonic vs Cell