Bootcache not updated correctly?

I am using FileVault2 on OS X 10.8.3 (12D78). After uninstalling Little Snitch, a utility which brings a kernel extension, the kernel extension is still loaded into the kernel during boot:
root# kextstat | grep -i snitch
   51    0 0xffffff7f80f51000 0x46000    0x46000    at.obdev.nke.LittleSnitch (3908) <7 5 4 3 1>
I do not understand where that comes from, since the kernel extension has been uninstalled.
After a
touch /System/Library/Extensions/
and a following
kextcache -v 6 -update-volume /
I can see how all kernel extensions are processed. The LittleSnitch kernel extension is not among them. This is expected, since Little Snitch has been uninstalled. The last lines of output are:
Created prelinked kernel //System/Library/Caches/com.apple.kext.caches/Startup/kernelcache.
CSFDE property cache does not need update.
/: no supported helper partitions to update.
And this is where I suspect something goes wrong. Probably the issue comes from using FileVault2. Everything that is updated by the above command is in the encrypted partition. At boot time some other cache must be loaded from a location that never gets updated again. In the Apple System Log I see messages like these:
2013-03-29 06:35:51 +0100 Safari[344]: ApplePersistenceIgnoreState: Existing state will not be touched. New state will be written to /var/folders/46/mf3zpgr542n00ldt1859tdp00000gq/T/com.apple.Safari.savedState
2013-03-29 06:35:54 +0100 com.apple.kextd[12]: Cache file /System/Library/Caches/com.apple.kext.caches/Directories/System/Library/Extensi ons/KextIdentifiers.plist.gz is out of date; not using.
2013-03-29 06:36:53 +0100 com.apple.kextd[12]: Cache file /System/Library/Caches/com.apple.kext.caches/Startup/KextPropertyValues_OSBundl eHelper_x86_64.plist.gz is out of date; not using.
2013-03-29 06:36:53 +0100 com.apple.kextd[12]: Rescanning kernel extensions.
2013-03-29 06:36:53 +0100 com.apple.kextd[12]: Cache file /System/Library/Caches/com.apple.kext.caches/Startup/IOKitPersonalities_x86_64. ioplist.gz is out of date; not using.
2013-03-29 06:36:53 +0100 kernel[0]: Resetting IOCatalogue.
2013-03-29 06:36:53 +0100 com.apple.kextcache[363]: rebuilding /System/Library/Caches/com.apple.kext.caches/Startup/kernelcache
2013-03-29 06:36:59 +0100 com.apple.kextcache[365]: / locked; waiting for lock.
2013-03-29 06:37:03 +0100 com.apple.kextcache[364]: Created prelinked kernel //System/Library/Caches/com.apple.kext.caches/Startup/kernelcache.
2013-03-29 06:37:03 +0100 com.apple.kextcache[363]: /: no supported helper partitions to update.
2013-03-29 06:37:03 +0100 com.apple.kextcache[365]: Lock acquired; proceeding.
2013-03-29 06:37:03 +0100 com.apple.kextcache[365]: /: no supported helper partitions to update.
Can someone comment on the '... is out of date; not using' and the 'no supported helper partitions to update' messages? Am I wrong thinking that the helper partition does contain a cache that is loaded during boot and having it not updated at this point is the cause of the problem?
I created the disk I boot from by creating one partition with a Mac OS X Extended (Journaled) Filesystem on it, installed 10.8.3 by holding CMD-R during boot and used Migration Assistant to transfer my data to the disk after installation. At that point Little Snitch was installed. Then I activated FileVault2 and later deinstalled Little Snitch.

I deleted these directories and files:
/Library/Application Support/Objective Development/Little Snitch/
~/Library/Application Support/Little Snitch/
~/Library/Preferences/at.obdev.LittleSnitchConfiguration.plist
~/Library/Preferences/at.obdev.LittleSnitchNetworkMonitor.plist
~/Library/Preferences/at.obdev.LittleSnitchInstaller.plist
then deleted
/System/Library/Caches/com.apple.kext.caches after issuing kextunload -b at.obdev.nke.LittleSnitch, rebooted and still:
root# kextstat |grep LittleSnitch
   49    0 0xffffff7f80f18000 0x46000    0x46000    at.obdev.nke.LittleSnitch (3908) <7 5 4 3 1>
And of course I have used the Little Snitch uninstall program in the first place.
Why I keep insisting on resolving this issue without reinstalling the whole OS from scratch is because I have the feeling there is more general underlying problem that relates to FileVault2. See my original post:
kextcache -v 6 -update-volume /
lists all kernel extensions it processes. The Little Snitch kernel extension is not among them. There must be some kind of cache involved that fails to get updated. The last lines of output from the above command indicate this:
CSFDE property cache does not need update.
/: no supported helper partitions to update.
If all the usual mechanisms do not work to get this cache updated I fear the same will happen if for example the next OS update is installed.

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