Anyone else struck by the idea that now maybe it's Chuck who is the agent, not Sarah? After all, with the past five years of her memory (mostly) gone, remaining an agent would be difficult and dangerous. If she did remain an agent, she'd really have to depend upon Chuck I think to fill her in an any relevant intel from the past that she'd need to know, in effect making him her handler.
Luckily, Chuck was
never very good at following the rules.