[A dismissive hand motion.] Eh, I wouldn't worry about it. I mean, we all come here with our own idea of how Things Should And Should Not Be Done [her tone there makes the capitalization clear] based on what we knew back home, right? So he was young or whatever, big deal. He did his thing and did it well, from everything I know.
I mean I'm not exactly the quintessential FBI employee, either! It's all a matter of using what you got. And you have a responsibility to use the best people to help head things up, even if they're not who everyone would pick.
[She didn't manage to change Hotch's mind on this issue, though she tried! Teenagers aren't ideal crime fighters but hey, this ain't an ideal situation.]