If you're talking about just Selene, you're talking about all Dragon Gods, they were stated to be relative to each other, and unlike Spriggans, we have no proof otherwise yet. Merc was nerfed from the start, and Aldoron was nerfed from the start and gradually grew weaker as the God Seeds was taken out.
Oh yeah i forgot that aldoron grew weaker the moment the god seeds died lol
You're right, Aldoron isn't Acnologia level, he went into hibernation because of Acnologia and awoke from said hibernation during his arc, but he's not as weak as you're making him out to be.
Yeah i guess i downplayed him to hard there
Um, you do realize Merc was basically only <= half of his power, right? This implies that it would have taken Ignia powered Natsu at the very least mid difficulty to defeat a full-powered Mercphobia. You're making it sound like Mercphobia was at full power, hell, he wasn't even in his right mind, he was running off of instinct alone, which makes him a worse fighter than he otherwise would have been, look at Acno when he was on autopilot for example, he was just a mindless beast wreaking havoc, same with Merc.
didn't merc go full power after natsu got the boost? cause i heard by some people that he did go all out
It is an impressive feat because both Mercphobia and Aldoron were nerfed and took extreme difficulty to defeat. If it wasn't for Ignia, <=50% mindless Mercphobia would have stomped Team Natsu into oblivion, while Selene is at her full power, and in her Human Form her full power should scale to around nerfed Dragon Mercphobia.