The brow can be an element they chose to put there. Neither 2 pre-evos have brows. In fact, they have the exact same face until the final one
Sobble2 has a line connecting its eyes. This is also present in Sobble3.
The argument would have to be that someone rendered an impressively good looking fakemon, sat on it for months, saw these stage 2s, quickly threw on a few elements and changed colors, and pushed it out.