It doesn't make sense...
The point was that after registering for one Castle, you cannot change it later. In my view, common sense dictates that SoD is the default. WT is by agreement. And also, if one thinks logically, they should decide immediately, rather than changing their opinions on the fly based on templates and the number of WT or SoD players. That is exactly the point—so people don't manipulate other players' choices.
Otherwise, in essence, I would have to sit at the computer all day changing Castles and tables for everyone. There were already many requests and everyone was refused, except for those who asked to change their Castle before this information was added to the tournament rules.