chronyd runs even if ntpd is enabled in systemctl

I have a Fedora 17 install on my laptop, chrony was doing something weird I didn't like
as posted in thread (putting unreachable hosts 69.164.222.108 and 216.129.110.22 into
chronyc sources list)
http://forums.fedoraforum.org/showthread.php?t=286718

What's really weird about the above thread issue was that only this one host out of my three
Fedora 17 installs does this so I decided to switch that laptop back to ntpd. So I used systemctl:
But upon reboot, the system insists on running chronyd instead of ntpd despite my running systemctl enable/disable. I know at install time chronyd is the default because Fedora 17 moved to chrony for time service but I thought you could still manually switch back to ntpd.

I then noticed that systemctl status on the two services show for the "Loaded" line:
so this seems to show that it ignored my enable/ disable commands before the reboot

Does Fedora 17 force the system to only run chrony no matter what you do with the enable / disable settings?