Being the pretentious git that I am, I just think it's kind of a foolishly arbitrary number to commit to unless you have every other factor set in relative stone, because it raises more questions than it answers.
Like during a slow day in the office, Koji Fox shouted at Oda-san from across the building, "Oda-san, how many Dragoons are there?" and fifteen minutes later, a voice in a hallway that sounds like Oda-san but can't be 100% confirmed to have been Oda-san shouted back "Uhhh.....like, thirty or something!"
"Yeah, but how many alive?"
"Ten! Ten's a cool number, let's go with ten!"
¯\_(ツ)_/¯
Like during a slow day in the office, Koji Fox shouted at Oda-san from across the building, "Oda-san, how many Dragoons are there?" and fifteen minutes later, a voice in a hallway that sounds like Oda-san but can't be 100% confirmed to have been Oda-san shouted back "Uhhh.....like, thirty or something!"
"Yeah, but how many alive?"
"Ten! Ten's a cool number, let's go with ten!"
¯\_(ツ)_/¯