Question: With the ability to migrate questions, I have found quite a few duplicates on both SU and MSO due to questions being migrated from others sites.

Do we handle these as normal duplicates or should we just let them be?

Answer: 
I don't think the Mortarboard, Epic, Legendary badges are quite the same.

Those badges simply award (repeatedly) hitting the rep cap; this question is asking for a badge for going beyond the rep cap

I'm no Jon Skeet, bu on many days, I've received thirty or forty votes for answers given after hitting the cap.

I think that there should be bronze, silver, and gold badges for getting 10, 20, and 40 votes on answers *given* after hitting the cap.
I like the concept. The situation happened to me several times, mostly before I got close to the daily cap and posted my final answer for the day. Next day I noticed I did not receive 180 rep from it - I felt cheated and discouraged.

There are one option which could set things strait again: ask for rep recalc and hope you won't loose rep due deleted questions. I guess I'll try it, just to see.

I suggest other names:

* Free advice - you did a good community job for free due The Cap.
* Out of business - you almost received rep from the community after you were out.
* Singularitee - your rep was absorbed by a wormhole