The process of taking ownership of files can be confusing - so
Mark made a file that you can download, unzip and merge with your registry so that the "take ownership" option will appear in the context menu.
I have Unlocker and have used it for years. Like you said, it moved the files that you were working with to the recycle bin. My
guess is that when the undelete process put them back, they inherited the security settings of the parent folder - so you could get to them. That is pure conjecture on my part because I have no way of knowing just what part of the security descriptors were messed up on the original set of files... so I cannot duplicate/test to see if the steps that you took will always work.
It does not sound all that safe. For instance, Unlocker could be deleting more files than the recycle bin can hold... then some would be lost. People are better off learning the take ownership steps.
Edit: I tested one situation on a folder that I had removed all but the system access to. Unlocker deleted the folder (and a subfolder with the same restrictions) but I could not restore them from the recycle bin. I tested this stuff in a Virtual Machine.