Yeah admittedly there's something a little weird going on with the outline of the upper lip in Mobile, it's a little smudgey/asymmetrical, but the key is that the mouth curve (in red below) is an almost identical match with the OG mouth, as opposed to the DT one that's really just a simple flat shape.
The Mobile guys definitely based their work off of pre-DT faces, while the DT guys... I dunno what they were doing. And you're right, the chin for Mobile is much smoother than the main game's.
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