Looks like the spacing in numbers between the 51 and 57 mean they are different NPCs, also 59 and 61, and the 97+ are with the ThunderaanI did a little more mining and discovered a few more texts that seem related to the quest, but it only makes it more confusing. There seems to be multiple lines that say similar things.
ID: Text
119150: You possess a powerful binding from the Firelord's kin. These are no toys, $r. Bindings such as these threaten even the great elemental lords. They are unspeakably dangerous to possess.
Do you seek to imprison the Windlord with these bindings? Or do you have some other intent?
119151: I do not fear the Windlord. As long as I have this binding, he should fear me.
119157: I care little of your Bindings.
Thunderaan has returned through the efforts of the Earthen Ring. The new Windlord has risen, and it is he you should speak to about these wretched creations.
But even then, just one Binding is of little use even to the Windlord.
119158: Bold, $r. The elemental lords are not known for their generosity.
Still, should you recover both bindings, and ore powerful enough to turn them into something of use, then I will arrange your audience with Thunderaan the Windlord.
Use the time between then and now to consider the wisdom of this meeting. I shall understand if you do not return.
119159: What would the Windlord require to arrange an audience?
119161: I have no desire to imprison the Windlord. I wish to come to an arrangement with him.
119162:Curious.
Thunderaan has returned through the efforts of the Earthen Ring. The new Windlord has risen, and it is he you should speak to about these wretched creations.
But even then, just one Binding is of little use even to the lord of Skywall.
119397: Mortal $r. You presume much to summon me.
119398: Ragnaros the Firelord once imprisoned me within bindings such as those you hold now.
119399: And greedy mortals not unlike you freed me only to strike and steal my weapon, and my power.
119400: But now that the Earthen Ring has seen to my return, I am inclined to show patience. Your errand may not be a foolish one after all.
119401: Give me the bindings that I might turn them against the Firelord and his minions, and I will reward you in kind.
119402: And so it is done, $r. Do not call upon me again.
119403: You possessed bindings such as those once before. An eternal prison from which you freed me only to jealously seek my power.
119404: I should strike you down for what you did to me. For what you stole from me.
Also to note, a few of the 119397-119404 have a note of "PlayerConditionID = 42188" or"PlayerConditionID = 42187" I don't see anywhere in the database at all where these numbers are mentioned.
Another thing: That new quest that popped up overnight is not listed in my database at all. I'm not sure if they have some way to hide it or something, but I can't figure it out. I'm sure there are people that have been looking at this type of stuff for longer that could possibly figure it out.
I'll keep looking.
EDIT: also their manner of speech is a bit different from one another