Unexpected interactions between init.d, upstart, "service" and "samba", "smbd" and "nmbd"

The /etc/init.d/samba script appears to try and start smbd/nmbd improperly. If a user types "service samba restart" here is the behavior:

root@cups:~# service samba restart
root@cups:~# echo $?
1

I tried to track down the problem a bit by putting "set -x" on the init script:

root@cups:~# service samba start
+ /etc/init.d/nmbd start

So the nmbd init script appears to be exiting improperly without any output. After putting set -x on /etc/init.d/nmbd:

root@cups:~# service samba start
+ /etc/init.d/nmbd start
+ PIDDIR=/var/run/samba
+ NMBDPID=/var/run/samba/nmbd.pid
+ unset TMPDIR
+ test -x /usr/sbin/nmbd
+ . /lib/lsb/init-functions
+ run-parts --lsbsysinit --list /lib/lsb/init-functions.d
+ [ -r /lib/lsb/init-functions.d/20-left-info-blocks ]
+ . /lib/lsb/init-functions.d/20-left-info-blocks
+ [ -r /lib/lsb/init-functions.d/50-ubuntu-logging ]
+ . /lib/lsb/init-functions.d/50-ubuntu-logging
+ LOG_DAEMON_MSG=
+ FANCYTTY=
+ [ -e /etc/lsb-base-logging.sh ]
+ true
+ init_is_upstart
+ [ -x /sbin/initctl ]
+ /bin/grep -q upstart
+ /sbin/initctl version
+ return 0
+ exit 1

Looking at /etc/init.d/nmbd:

 24 case $1 in
 25 start)
 26 if init_is_upstart; then
 27 exit 1
 28 fi

And if we look at how /etc/init.d/samba start nmbd we can see why it exits at this point:

 16 case $1 in
 17 start)
 18 /etc/init.d/nmbd start
 19 /etc/init.d/smbd start
 20 /etc/init.d/samba-ad-dc start

Please note /etc/init.d/smbd also has a similar call to init_is_upstart.

Here's the behavior of all the init scripts in question when both smbd and nmbd are stopped initially:

root@cups:~# /etc/init.d/nmbd start; echo $?
1
root@cups:~# /etc/init.d/smbd start; echo $?
1
root@cups:~# /etc/init.d/samba start; echo $?
1
root@cups:~# service nmbd start; echo $?
nmbd start/running, process 32731
0
root@cups:~# service smbd start; echo $?
smbd start/running, process 32741
0
root@cups:~# service smbd stop; echo $?
smbd stop/waiting
0
root@cups:~# service nmbd stop; echo $?
nmbd stop/waiting
0
root@cups:~# service samba start; echo $?
1

Expected behavior:

Calling "/etc/init.d/{smbd,nmbd} start" exits 1 and prints a short message to stderr explaining that the user should be using "service {smbd,nmbd} start".

Calling "service samba start" exits 0 and successfully starts smbd and nmbd.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: samba 2:4.1.6+dfsg-1ubuntu2.14.04.1
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
Date: Tue May 20 12:20:34 2014
InstallationDate: Installed on 2014-05-16 (3 days ago)
InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
OtherFailedConnect: Yes
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SambaServerRegression: No
SmbConfIncluded: No
SourcePackage: samba
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.init.d.nmbd: [modified]
modified.conffile..etc.init.d.samba: [modified]
mtime.conffile..etc.init.d.nmbd: 2014-05-20T12:11:20.828235
mtime.conffile..etc.init.d.samba: 2014-05-20T12:11:08.484234