Yes on all counts. cIOSCORP is installed and can be removed by running the uninstaller. You can then update the revisions manually.
Since I'm in the middle of writing something up i happen to have the list of revisions to update to (after the uninstaller) handy.
None of those are stubs.
You'll also need to uninstall these after the Uninstaller runs (assuming your friend's Wii is not Korean, which is my guess):
IOS40 (rev 6174)
IOS41 (rev 3091)
IOS43 (rev 3091)
IOS45 (rev 3091)
IOS46 (rev 3093)
IOS52 (rev 5661)
You can also always check an updated list of all IOS files here.