I play Modern and have a Ivory stronghold.
When I go second I see three possibilities how to handle dual sided strongholds in Modern:
1. I use the white side and get a Legacy holding.
2. I use the black side and get a Legacy holding.
3. I may decide to use the black side and get a Legacy holding or may use the white side.
According to the comprehensive rules
I think it is option 1. Because Ivory Rules are used and I have the option to start with a Legacy holding in play when going second.
However I think option 2 or 3 is much more appropriate since the dual side wanted to replace the starting holdings. I favor the option 3 because I'd like to choose.
By the way I think the comprehensive rules could be a bit more condensed, may I make a suggestion or is this unwanted?