That doesn't make sense. I misread it and thought the issue was them being so sure Tenno was an experienced adult they didn't even bother looking at the 10-20 years age bracket, which I really liked but I was going to point out you had too few names because there's no way Dragon or Narwhel would fail to look at all the various alternate spellings and similar sounding names which increases the number of results to ~20.
The spelling mistake doesn't work because Saint wouldn't be speaking clearly and they'd know he might be wrong so they'd look for similar sounding names as well and alternate spellings.
Good thing they know Tenno is female though - without that they'd have had to also look at variations like Herbert Taylor (676 people in the US with that name). numbers based on results from
How Many of Me
I really liked your view of Contessa.
EDIT:One thing about your comment regarding unwritten rules - There's no unwritten rule about not using lethal force when someone is trying to kill you. Lisa included not killing in the unwritten rules, but that's an agreement that both sides won't do that. As soon as one side decides they are going for lethal force that would go out the window. Not that the PRT would automatically start using lethal force on someone trying to kill them, but that's an issue of PR and large organizations often hampering themselvs due to the disconnect between the grunts at the pointy end and the decision makers.
Nope. Unless someone has a personal interest and a lot of money and lawyers involved a person needs to be missing for at least 7 years before anyone would consider declaring them dead. "teenager with problems at home disappears" is the sort of case where the person can pop up 20 years later.
For that matter you have people in their 40s working for their parents (like all the "Smith and sons" or similar shops). I doubt Dragon assumes it's a codeword, she doesn't have the background to jump to that conclusion (Narwhel might if Dragon told her about it) but "she's working with her father" doesn't narrow the age range much, although might allow them to exclude people whose father is dead or otherwise not able to work with them.
I haven't seen Mirage, however there are some very well developed teenagers. There are people who can pass for 20 at age 15, and I know a lady who got mistaken for a highschool student when she took her younger daughter to her first day of school