Erasing above removes the record of what Kenward did. It does not remove the documents Kenward mirrored from your sources, and those are where a person's mail, files and messages actually sit.

Nothing records which documents are about a person. A document carries who may see it, which is a different question: erasing on that basis would delete other people's records and still miss the ones that name the person and were never shared with them. Guessing is worse than not offering it.

Disconnecting a source stops Kenward reading anything further from it and leaves what it already mirrored in place. Removing those documents is a separate thing that this product cannot honestly do yet.