No he is not. As Martinez correctly said, Handling training also trains Passing as secondary skill (and I don't think Handling training trains OD but if you have experienced an OD pop while training Handling then say it and it will be the first notice I have about it).
I don´t have real numbers, or images of sets of skills to prove you what I'm saying, but I have friends (real life friends) who play this game and some of them have trained Handling or Passing to guards, and they have experienced what Martinez told ya: that both trainings are secondary training of the other (to make it easier to understand: if you train Handling you also get a percentage of Passing training. If you train Passing you also get an amount of Handling training).
All things considered, are you sure about the Handling - OD thing? Please answer