You wrote a lot and didn’t anwsered any questions.
The point isn’t if the Vulpera are more likely than Gilbin, it’s obvious they are, the point is that they aren’t relatable to the Goblins in any manner to be the Goblin Allied Race. A different way to look at it is to show how the Nightborne are the Blood Elf Allied Race because it was the Blood Elves who recruited them, not because they share models.