I agree. The unlinking process needs some improvements. Say you select a group of 4 docs and Link them. I'll call them Docs A, B, C and D.
If I want to remove C from this linked group, I select C and choose "Unlink All." For C, this removes the links to the other 3 documents. HOWEVER, if you look at A, B and D, C still appears as a linked document on each of those. So even though I removed the links from C to the other documents, C still appears as a linked document on those other documents.
It seems like when you use "Unlink All" on a document, it should not only remove the links from that document to the other documents, but it also should remove the links from the other documents to that document. It should be a two-way street.
So, in order to remove a document from a linked group, you must use the "Unlink all" on each document in the group, then go back and re-link the ones you wanted to keep linked.
And if you want to unlink a group of documents that you previously linked, you must use the "Unlink all" on each document in the group.
It would be great to have a way to unlink a group of documents all at once, or remove one document at a time from a linked group.