Ricca's dead. Only a couple of us made it inside. We couldn't hold the entrance- there were just too many. Only way we could go was down. We'll hole up for a few days, wait for the Ghouls to move on, then get outta here.
The corpse is identified by the Creation Kit as Erris (editor ID: DN059_Erris)
Ricca's corpse can be found on a rooftop in College Square, above the station.