Just because there are only 10 in active Service of Ishgard doesn't mean there are only 30 soulstones. The text does not explicitly say such a thing. Alberic was allowed to keep his soul stone after he retired as Azure Dragoon and passes it over to the WoL. That would imply there are many more soulstones than only 30. (Because if there were only 30, there's no way he would be allowed to keep his soulstone after retiring. They would NEED it for the new dragoon that would take his place.)
While if your character was a part of the Order that does throw a huge wrench in your character backstory, it's still possible to have a Soulstone, and be a Dragoon without being a part of the order. It's also possible that there are indeed reserves for this part of the military or teachers and such that are not counted in this.
Also please consider that the Temple Knights of Ishgard are different from say the militant forces of say House Fortemps. You can be a Knight of House Fortemps and not be considered a Temple Knight. I assume such things would probably be available for Dragoons as well, although that is entirely my personal interpretation. Those whom would be like a House Dragoon or some such thing, would also not be accounted for in that active service.
A Dragoon is just another title and ranking for an elite type of solider. It's still possible to have the same skill set or something similar while not being a part of the order. It's not like the WoL in the job quests is actually considered a part of order, or at least that is also my interpretation.
While if your character was a part of the Order that does throw a huge wrench in your character backstory, it's still possible to have a Soulstone, and be a Dragoon without being a part of the order. It's also possible that there are indeed reserves for this part of the military or teachers and such that are not counted in this.
Also please consider that the Temple Knights of Ishgard are different from say the militant forces of say House Fortemps. You can be a Knight of House Fortemps and not be considered a Temple Knight. I assume such things would probably be available for Dragoons as well, although that is entirely my personal interpretation. Those whom would be like a House Dragoon or some such thing, would also not be accounted for in that active service.
A Dragoon is just another title and ranking for an elite type of solider. It's still possible to have the same skill set or something similar while not being a part of the order. It's not like the WoL in the job quests is actually considered a part of order, or at least that is also my interpretation.