Not in the first generation. Mottling is recessive. Mottled carriers often have a few mottled feathers, but that's all. What you're seeing is silver leakage. Leakage happens when you cross different varieties. A color can look the same as something else, but not be that. For instance, I had a d'uccle/serama cross who was mostly white with a few buff and black feathers. She could've been dominant white or silver, but I knew her serama parent had extreme mottling, and since her d'uccle parent also had mottling, I knew she was mottled. Also, she had buff down as a chick, which wouldn't have happened if she was dominant white.
A mixed breed rooster without mottling:
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A mixed rooster with mottling:
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