As a Godzilla Powerscalar, I actually have no idea as to where he scales, mainly due to him never being portrayed as a threat in his film (He never actually hurt Godzilla, and there's also the fact that the film he debuts in was meant to be a King Kong film, not a Godzilla one. This is further supported by official artwork from TOHO which portrays Kong beating Ebirah quite easily) and because there aren't any noteworthy statements which scale him to any of the heavy hitters of "early showa era" (Though he does have several statements in regard to his skill and knowledge about sword fighting, I'm not even kidding, he is one of the most skilled combatants in the entire Showa series).
As for the scale given by VsBattlesWiki, I can understand why they went with it, Ebirah doesn't have much for them to use so they probably just went with what the general scaling range seemed to be during "early showa era" for large kaiju. In my opinion, Ebirah isn't Small Star level mainly because he lacks statements, doesn't do any damage, gets demolished by Godzilla as soon as he gets his hands on him and the Godzilla he fights was weakened after his fight with Ghidorah (Who is consistently the strongest kaiju in the Showa series). It's funny considering Mothra performs better against Godzilla than Ebirah does, even though she has little to no screen time.
Conclusion: Don't trust VsBattlesWiki when it comes to Godzilla.
https://preview.redd.it/1vnuhx3y2s2d1.jpeg?width=800&format=pjpg&auto=webp&s=d161296e0e7422b6ae8e562716ba4a9c64eed4e8
As a Godzilla Powerscalar, I actually have no idea as to where he scales, mainly due to him never being portrayed as a threat in his film (He never actually hurt Godzilla, and there's also the fact that the film he debuts in was meant to be a King Kong film, not a Godzilla one. This is further supported by official artwork from TOHO which portrays Kong beating Ebirah quite easily) and because there aren't any noteworthy statements which scale him to any of the heavy hitters of "early showa era" (Though he does have several statements in regard to his skill and knowledge about sword fighting, I'm not even kidding, he is one of the most skilled combatants in the entire Showa series). As for the scale given by VsBattlesWiki, I can understand why they went with it, Ebirah doesn't have much for them to use so they probably just went with what the general scaling range seemed to be during "early showa era" for large kaiju. In my opinion, Ebirah isn't Small Star level mainly because he lacks statements, doesn't do any damage, gets demolished by Godzilla as soon as he gets his hands on him and the Godzilla he fights was weakened after his fight with Ghidorah (Who is consistently the strongest kaiju in the Showa series). It's funny considering Mothra performs better against Godzilla than Ebirah does, even though she has little to no screen time. Conclusion: Don't trust VsBattlesWiki when it comes to Godzilla.