I feel this one is a very bad episode. Struggling with it since last night... The script is absolutely not believable. First very big problem, the guy that stole the car spoke with who asked him to steal the car directly, he was cooperating, yet they based the investigation on his description of the guy he smoked a cigarette with, they didn't go with photos of the owner of the restaurant and his associates to check if it was one of them. Makes completely no sense, it's there only to force the issue of the unwilling informant.
After that OA is confronted by Mona and loses the argument without being able to find any good reason for the FBI to behave like that, even if there are a lot, the same one used by his boss in the end are a good example, and are things he should know very well considering he has informants of his own.
Then he speak with his boss and his arguments are so weak he can only be smothered with them.
Back to Mona and he get smothered again in the same argument on the other side, he still has nothing convincing to say even though he has just heard what he should say about the matter.
It really seem forced from start to end. They needed OA to lose today, but I don't really feel they did it well, surely not believable to me. I feel they need Mona to go, but it would have been a lot better if he just told Maggie they broke up without giving a reason instead of this.