[Rumpelstiltskin]

I run it :

[Unit]
 Description=Job that runs Kodi
 After=default.target graphical.target getty.target sound.target
[Service]
 User=kodi
 Restart=always
 RestartSec=1s
AE_SINK=ALSA
ExecStart = /usr/bin/xinit /usr/bin/dbus-launch --exit-with-session /usr/bin/kodi-standalone -- :0 -nolisten tcp vt7
[Install]
 WantedBy=default.target

So i dont have a wm  

Why not following this how-to you currently highjack? :-)  

 now run it in openbox : see the

DETAILED log
only video log