Said attack didn't affect the ground they were standing on, it affected everything around it so one could argue that they pushed away by the shockwave of the attack. We've known that fire dragon slayers can control what they burn ever since Natsu's fight with Erigor, so it's not farfetched to say Ignia chose to not aim the full power of his attack on them when his goal was to showcase the difference in strength between him and them. Also, you realize that your argument of Ignia's attack (>>>body heat>>>labyrinth) doing "jack shit" to Suzaku doesn't make much sense since Natsu's attacks (<<<labyrinth) were able to damage Suzaku. Either 100YQ scaling is wack asf, or Selene wasn't trying throughout the ENTIRETY of her fight with Suzaku.
Not really. I've already explained that Dogramag no diffed the labyrinth with a hand wave in his HUMAN form, something which every FT and Diabolos member failed to do with named attacks so far. Many of these characters are those you consider to be on par with human form dragon gods, who are canonically much stronger than Dogramag, so the only explanations are either 1) they aren't actually on par with human dragon gods, or 2) Dogramag is much stronger than before. Anyways, I don't think we should drag this out any further since the future chapters are hopefully going to confirm if Dogramag is stronger than before or not.