We had at least one deep descripton of -I think Nimitz- misdirecting another cat by leaving out information. As far as that goes, Stephanie's partner does something of the same thing when he is trying to figure out what is going on at the Harrington homestead and then with Stephanie.
The difficulty with Alignment (and others who don't know they are working for the Alignment suiciding is that when they stop passing information, somebody may go looking for them. Manticorian security may be good enough to keep the circumstances of the deaths more or less quiet but unless they can make the persons disappear there will be something. Even if the cause of death is something medical (aneurysm, heart attack etc) the agent's handler may be able to see a death notice and obit and when that is reported back up the line the cause of death could be matched- way back now at Darius- with what the nanites for that agent were supposed to cause.
Stopping the outflow if information is critical as is identifying who was passing it and what is likely to have been compromised. On the other hand, having them "just die" leaves you with mostly traditional detective and spycraft work to try and find out where and through home (and how) the agent has been communicating. Lots of leg and computer work. Also the possiblity of tripping alarms to let the handler know someone is investigating. But that is all part of the workload. What are the overlaps, what are the similarities what joins this and any other persons in the investigation together. Detective work and research.
It is also going to give the Alighment a few headaches beyond havin lost a lot of sources. They may have to even pull out more than a few people who may be at risk of being identified and exposed- which would let the detectives follow the trails.