Linking questions without 'penalising' one as a duplicate

Question

The following 2 questions are essentially duplicates, along the lines of
'Cannot sign out of iCloud because of an old email address'

Unable to sign out of iCloud; linked to old email that no longer exists
iCloud Catch 22 - Cannot sign out of old dead Apple ID on iPads

For the first, the solution was 'this is a bug that needs fixing'
For the second, it's 'there now is a solution since iOS 9.0.2'

So, the first did all the work, yet the second found the fix.

imho, both are worthy in & of themselves, but as a pair they show not only the solution, but also some back history to the problem & research done in trying to fix it.

I've already added a comment to the first to point to the newly-available solution.
They each show as 'Linked' in the right margin - though I'm not sure how many people actually use that to follow a trail of bread crumbs.

How do we better link them without 'penalising' either by marking it as a dupe? Especially as it's the newer question that has a working fix, so the 'this has already been asked & has an answer' message would give off all the wrong signals.

Add a Link in an answer - edit the original or post a new one?

Add a Link to the top of the original question "Since iOS 9.0.2 there is now a solution to this issue 'here'" ?

Any other possibility?

Answer 1

I didn't look into the dupe-worthiness of the two questions mentioned, the following is rather a general answer.

Avoiding redundancy by closing duplicate questions is actually a good thing. There is no such thing as a penalty if a question gets marked as a duplicate. Any reputation gained by upvotes on either the duplicate question or one of its answers remain. Also, there is no ownership on posts (see https://apple.stackexchange.com/help/editing), so if anybody gets an ego problem from having a question closed as a duplicate, he/she better deals with this off-site.

If you run into potential duplicates, by all means either propose to close, comment or flag them. In cases where it make sense, the mods also have the option to physically merge all the answers from both questions into one (which may keep things a bit more tidy especially if the newer question got the better answers).

PS: Oh, and whatever you do: DO NOT edit the question to include the answer (or a link to an answer). It heavily confuses people and the search functionality. Either flag as a duplicate, add a question comment with the link or post an answer pointing to the actual answer (which is one of the very few occasions where a link-only answer is ok IMHO).