So many Dragonns in Ishgards.... I thought there supposed to be only one per era?

[Bombast]

There's Dragoons (Ishgard heavy infantry), and theres Azure Dragoons (Mentally and Magically Linked to Great Dragons).

All but two Dragoons belong to the first group.

EDIT:

As for there being two Azure Dragoons, that essential a function of the Warrior of Light. We can jack skills from pebbles. We also, for all the talk of their being Azure Dragoons, don't seem to be a proper one - While I think hearing the dragons is mentioned a couple of times throughout the Dragoon story, we don't seem to be connected to Nidhogg, at least not to the degree that the proper Azure Dragoon is.

EDIT EDIT: Also, who know what happens in Heavensward? Maybe Ishgard discovers how to connect more people to Nidhogg, creating more Dragoons. Maybe that's a bad thing and we have to deal with it. Maybe Cid realizes that all a Azure Dragoon is is a madman who can jump high and is allergic to life, and creates some sort of aetheric powered spring boot for Ishgard.

The possibilities are endless.

[LineageRazor]

We also, for all the talk of their being Azure Dragoons, don't seem to be a proper one - While I think hearing the dragons is mentioned a couple of times throughout the Dragoon story, we don't seem to be connected to Nidhogg, at least not to the degree that the proper Azure Dragoon is.

While it's been a while since I did the Dragoon quests, the impression that I got from the final cutscenes was that YOU, the player, are the true Azure Dragoon, not Estinien. After you defeat him in combat, Estinien calls upon Nidhogg's power, but that power chooses you instead of him, much to his frustration and indignation.

Given that Estinien allowed himself to be so deeply influenced by Nidhogg that he was willing to turn on you and Ser Alberic, this doesn't seem out of the question. While it's true that Alberic's mistakes lead to the destruction of Estinien's home town, legitimate grounds for a grudge, it's made pretty clear that Estinien is being influenced into his violent turn. Would a true Azure Dragoon fall so easily to a dragon's sway? I think I even remember him babbling about the greatness of Nidhogg or some such at some point, but I'd need to go back and rewatch those cutscenes to be sure.

[DracotheDragon]

There's Dragoons (Ishgard heavy infantry), and theres Azure Dragoons (Mentally and Magically Linked to Great Dragons).

All but two Dragoons belong to the first group.

EDIT:

As for there being two Azure Dragoons, that essential a function of the Warrior of Light. We can jack skills from pebbles. We also, for all the talk of their being Azure Dragoons, don't seem to be a proper one - While I think hearing the dragons is mentioned a couple of times throughout the Dragoon story, we don't seem to be connected to Nidhogg, at least not to the degree that the proper Azure Dragoon is.

in technicality arnt we an azure dragoon since we are connected to midgardsommr?