ED-E My Love: Speaking with Lorenzo with ED-E in one's party will unlock an unknown audio log. He will also, after some time when both of the logs have been unlocked, contact the player character and wishes to access ED-E's software, and in return will improve ED-E's defenses.
If the player character chooses to assist Head Paladin Hardin to overthrow McNamara, they will not be able to complete Still in the Dark, if one has spoken to Lorenzo about the filtration system before Hardin takes over the player character can still turn in the parts to him, but McNamara will no longer have the completion dialogue. If one does not speak to Lorenzo about the filtration system before Hardin takes over, it is still possible to get the starter dialogue from Lorenzo, but one will not get his dialogue for turning in the parts even if the player character has all the parts in their possession.
If one has chosen to turn in ED-E to Lorenzo while tasked to find replacement parts for the bunker's air filtration system, Lorenzo will disappear from the game until ED-E is sent back to Primm. PC users can fix this problem by using the console.