User blog comment:IamJakuhoRaikoben/Chapter 433 & 434: Ikusatsunagi & Demolition Fist, Review./@comment-25111584-20150511230514/@comment-25111584-20150512100912

The only God Slayer whose Magic showed itself to be more powerful than its Dragon counterpart is Chelia. And, for all her klutziness, Chelia is considered a prodigy. Whatever Zancrow did, Natsu eventually managed to replicate. Laxus and Orga never actually got to fight. .-.

If we consider different elements, then Natsu was unable to defrost Devil Slaying Ice, but Silver was able to freeze a Fire Dragon Slayer with ease. But this in no way means that Devil Slayers are superior to Dragon Slayers. Silver was just more powerful.

Also, even if Gods are stronger than Dragons, you still have to consider tiers. Who says Ikusa is a strong God? Arlock was able to summon him by just burning his face off. In the long run ... its just cosmetic. Not much of a sacrifice. Nowhere near what Lucy sacrificed to summon the CSK. Would you consider this God to be stronger than the CSK? Again, just because it is a God doesn't mean its extremely powerful. It might be a pretty weak God. Look at Demons. They stretch from Galuna Islanders to E.N.D. Ikusa is mp just a mid-tier, somewhere around a 9DG's power. So, no, Natsu defeating it doesn't mean he could do the same to an Eclipse Dragon.