OK, I purchased Sgt. RL-3, and then got Star Paladin Cross to follow me as well once I reached the Citadel (there's a glitch that allows that), and the three of us had a fine time chewing up everything from muties to mole rats. However, once I retrieved the GECK and got snatched by the Enclave, they both returned to their "waiting places" (Canturberry for the sergeant, the Citadel for Cross). To make matters worse, after dropping my karma to the point that I could rehire the robot, I got it up to Good, but Cross wouldn't follow me because I already had a follower (in other words, the glitch that I exploited to hire her isn't repeatable). So, I'm wondering: is there any way I can keep my follower(s) in my employ after I get captured in Vault 87?
I'm sorry to say that I do not have any DLC, and I use a PS3 so mods are impossible as well.