The Under Construction list is just up there for a guideline of who wants to do which themes. I think it could be trimmed, but it doesn't really hurt anything. I'd say that if someone wanted to host a mafia based on a theme that has been up on the Construction list for a long time, then we could probably bump the player who originally laid a claim. Some of the themes I don't forsee ever being claimed to be honest.
If you really want to trim the Construction list down, I'd say that Max, Oddity, Sonten, and Wigs could all be removed since they have had claims to those games for over a year, and we have not heard from them in some time on any form of progress or interest in mafia. Myself personally, I don't see an issue until someone else claims they want to host a theme that some one else has had claim on for over a year or more.
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