Something that I've noticed is that Paul is continually shifting his people around. I never realized how many times he uses the phrase, "I am sending...to you." In II Timothy 4, we find Paul giving a list of people that have left: Demas, Crescens and Titus. I've always assumed that all three simply gave up, but I never noticed that only Demas was definitely a quitter. The other two may have been sent elsewhere. In Titus, we find that Titus has been made the elder of Crete, when previously, he was in Dalmatia, and Paul is requesting his presence in Nicopolis.

Tychicus and Onesimus are also frequent movers. I'm thinking about adding in an appendix of where the various followers went to.