Would it be possible to add a new page to Tags to show all users who earned a tag badge? This could be a link next to top users (see the image below) and show users grouped by the tag badge type (gold, silver, bronze).
Isn't this redundant with the "Top Users" tab?
The Top Users is already showing the reputation earned, from there you can already deduce who earned which badge.
The only downside of the Top Users tab is that it shows only Top 20. Perhaps this could be extended to allow browsing through all the users who earned reputation in the given tag.