As far as trading him to a different family, Joseph might not be as emotionally loyal, because that's not something anyone can just automatically do. But he wouldn't be disobedient. If asked to drink the hard breaking potion, his only resistance would be to politely ask the master to reconsider, pointing out that he has been a much more effective slave since his last hard breaking ended. Even that's only because he feels so strongly about his hatred for the potion. If the new master insisted after that, he would drink the doses without further complaint. ... He's... incredibly messed up, really. Honestly, I rarely play characters that are that gorram submissive/broken.

It's hard for me to understand the collector's mentality, because everything that makes him valuable as a Leader has made him worthless as a slave. To turn him into a slave, you have to obliterate his identity as a Leader, and then it seems like he wouldn't be as valuable as a collector's item. Does that make any sense?