Overthinking it at this point. Yes there is a clear seam. But I think it's also clear now that it is not a swap out part. They would have advertised it with a bunch of their buzzwords if it was silicone or had swap out parts. "Interchangeable newly devloped outer jaw" or "Interchangeable newly devloped silicone jaw".These pictures make the jaw situation even more confusing as you can clearly see a seamline, I wish they would just tell us
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The seam is more than likely there because the majority of the jaw/mouth piece is made of rubber and is glued onto the rest of the head