Ok this is kinda crazy and I’m not sure whats up…
If I compile the current firmware with USBType MIDI - 16 shows up as 4 devices (Port1, Port2, Port3, Port4) which should only happen when you select MIDIx4
Compiling with USBType Serial+MIDI works as it should (shows up as one 16n).
Can anyone else confirm that behavior or are my devices haunted?
EDIT:
Welp - Totally Haunted is my verdict. 
(I think it’s some leftover from Audio Midi setup thinking it was a MIDIx4 setup from a previous thing I had programmed that particular teensy for. I had to delete that device from Audio Midi Setup and it fixed it)