Sometimes different sources mention different facts about the same person and sometimes these "facts" are incompatible. I would to the ability to create a profile for each source and then link these profiles with a new link type "is alternative".
Example 1:If one source has different parents for a person then the other source, you create a profile for each and link the profiles as "is alternative". When there is prove an alternative is wrong, you should be able to mark it as wrong and add some proof of why it is wrong (just deleting could mean somebody will add it again, but it should be possible)
Example 2: Names in different languages. You could make alternative profiles for different languages. This will make it easier to find the profile.