Wendy's roar did
hurt Zirconis. He might have been a weaker dragon so maybe Jura might not be a good comparison. But an enchanted Mirajane in Sitri
attacked Zirconis to no effect. So there's at least some kind of indication that dragon slayer magic is more effective against dragons than other magic. It's just a more pronounced in tartarus where demons were a lot weaker in durability.
Yeah, you're right, my bad. I meant Wendy can't even inflict significant damage to Zirconis. But I misunderstood you because you were talking about hurting him, so I agree with you on this one.
Well of course Gray had power in his attack, but how much do you think? Is he using dragon force level power?? He actually out-performed DF Natsu. So the demon slayer advantage is at least as much as the advantage DF gives Natsu.
No it doesn't. For the bold to be true you would have to know or have an idea about how effective DeS magic is to demons. We don't know this. The feats from the fights elude to the efficacy of DeS magic, not the power. From the look/AoE/style of the spells Gray used it just seems like he's using comparable DS moves - that suggests that they are similar in power; not the DC feats against the demons is skewed by slayer advantage.
Well first of all, just like above, I would need an idea of how effective slayer magic is. However I do know that slayer magic is more effective, so a non-DS wizard who wins extreme diff would have an easier time with DS magic.
I would give Gray the same damage output as Gajeel or more and maybe Natsu. In my opinion, Gray and Natsu were fairly equal in Tartaros. Natsu only pulled ahead in Alvarez [Gray lacks in Feats]. The basis for my statement is that how Natsu fared against Jackal/Franmalth/Tempesta is comparable to Gray and Silver. Again, I don't exactly know how accurate these
Tartaros Character Cards are but because they were supposedly created by Hiro Mashima you can compare them if you want. I wouldn't buy anyone who said Franmalth/Jackal was stronger. Tempesta, on the other hand, is similar to Torafusa and they are the closest you can get to Silver/Kyōka but still not above them. Now, considering Silver's stats, Gray handled his attacks pretty well. Yes, Gray couldn't inflict much damage on Silver but he was immune to Gray's attacks leaving him at a disadvantage. For those who thinks I'm making an excuse, refer to Natsu vs. Totomaru. Natsu did average in his fights.
Now DF Natsu and DeS is Gray is harder to compare because of slayer advantage but you can still see Gray has a lot of DC just like Natsu. First, Gray was able to kill Mard Geer with only a couple of attacks as long as it connected with him. Natsu wasn't able to kill Mard Geer at all; however, he did overwhelm him quite a bit. Basically, I'm trying to say that Gray's ability to kill Mard Geer is slayer advantage. DeS Gray would probably do the same damage as DF Natsu but neither could kill him while slayer advantage allows Gray to just kill Mard Geer in a few hits.
That is why I say DeS and DF are pretty much equal until Natsu starts dragonizing but that is different. Dragonizing would increase Natsu's stats in which Gray wouldn't be able to keep up. DF is just a way of getting there. Using DF just means that you are getting closer to become a dragon. It does not say you have the power of a dragon or Natsu wouldn't need Igneel's flames.
But let me ask this. You have Gajeel and Gray(w/o DeS) as relative equals. Gajeel won extreme diff v Torafusa. So without DeS I assume you give Gray an exteme diff win over Torafusa. But we seen Gray low diff someone comparable to Torafusa, so doesn't that speak to slayer advantage?
This is also very tricky to analyze. I would be lying if I said I'm not using any speculation but this is how I see it. Torafusa was actually defeated by ISD Gajeel with Extreme Difficulty. Base Gray might or might not lose. Considering his feats against Silver, he might have the upper hand but you and many others can bring in the fact that he won by a cheap shot especially with a steel ball. Either way though, Gray's durability is definitely there though as we saw him tank
Ice Demon's Rage from Silver who has stats like Kyōka.
I admit I would place Gray and Gajeel as relative equals but in my mind, DeS is closer to DF than ISD or LFD. So because Gajeel hasn't attained DF yet, I still rate Gray a little higher until proven otherwise. To answer your question about slayer advantage, in this respect, slayer advantage would probably provide the same amount of benefits as his fight with Mard Geer but damage output should be a little bit above Gajeel.