The hydra gets it at the end. Don't you think the FBI will utilize the data they got from the SR sever to go after the merchants there?
What data exactly do you are think they recovered? Nicknames, product lists, public keys and and country seems like about it.
Was pgp mandatory? If not there are at least some postal codes and consumer addresses.
I have no idea, but if they can handle TOR they can handle pgp, and it would be fucking dumb to not use it.
However, if they do recover addresses of recepients, you can bet your ass they will be added to some surveillance lists. This will help with investigations in the long run if they can get a large enough sample of TOR drug pirchasers to watch. However, it will be used for to profiling, which always carries the risk of creating prejudice.