Different Shutdown process from Kodi or ssh

[Gauner]

Ok, I figured at least something out:
XBian uses the upstart mechanism for booting, right?

Terminal

xbian@xbian / $ /sbin/init --version
init (upstart 1.13.2)

and

Terminal

xbian@xbian / $ systemctl status
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down

tell me so.

Terminal

xbian@xbian / $ sudo shutdown -h now

executes the scripts I put in /etc/init.d/ and symlinked in /etc/rc?.d/. These folders also belong to the upstart- / System-V-system. But they don#t get executed when shutdown from Kodi (I also check whether the passed parameter is different - it isn't, they don#t get executed at all).
On the other hand, scripts inside /lib/systemd/system-shutdown/ get executed as well, also if I shutdown from inside Kodi. This folder belongs to the systemd-System.

So, I ask: Is Kodi using systemd, while the rest of Xbian uses upstart? Is this a bug?