This makes perfect sense 
I do this all the time … most of the creative work OTB, but later the “craftsmanship” like mixing and mastering ITB.
Maybe the other guys are right and it could be a Logic specific issue. I work with Ableton Live and there are two Midi-settings per track only and easy to find on the screen. One is Midi-source and one Midi-destination. The routing is according the setup.
Seems that you got a step forward to reach your goal …