User blog comment:FairyRaven/Fairy Tail Chapter 470: Hybrid Theory, Review and Commentary/@comment-1359322-20160125125836/@comment-27010145-20160125151743

Hey lets put this into perspective for a second. You said that Igneel is stronger than any of the humans we've seen to date..., but that is almost understating Igneel:p Judging by the humans vs dragons battle from GMG, I would say

Igneel > Natsu + Wendy+ Laxus+ Cobra + Sting + Rogue + Erza + Makarov + Jura + Lyon + Kagura + Bacus + Cheria + .... you get the point, basically everybody at the GMG combined.

Was one dragon slayer even able to take away 5% damage from a dragon? And Igneel is probably a tier above those dragons from the GMG.