Rather than noticing the weaknesses, he should probably pay attention to the fact that it’s a specific person’s blue dragon. The one who ‘defeated’ it previously probably just tamed it.
@speedysam0
But how did you come to that conclusion?
The dragon was named after MC showed it to the guild master.
The town's name "Delight" might have come from a famous person, but that doesn't mean it's connected to the dragon. Since they only named him that way because it appeared in Delight.
@speedysam0 that makes 0 sense...the name wasnt written in a book it was named jus then so whether or not "Delight" is a famous person's name, that is not even a sensible piece of evidence that he tamed the beast