I keep Rad and the 2 lady knights that you get because I don't have time to train a squire from level 1.It slows ya down. Just keep all 3 and then get a squire and train him with them and they share jp. Its easier that way and I usually make Rad an Oracle and the Knights,I make one a Monk,and the other into what I need.Or I just train her in all jobs.
I throw away Boco because he's full of crap after a couple of battles so after he lays an egg and I get a black or red one he's oven roasted choco for the team to eat. Then I get all the storyline people and keep Byblos for a second and throw him away(I can't really find a use for him other than poach) and I keep a vampire at all times.