Hey there. So as more Halo Online maps are coming to Halo 3, I really don't think it's a good idea to bring Diamondback to Halo 3 because there already exists a map within Halo 3 that uses the exact same layout (Avalanche) and I don't expect more than one map with the duplicate design to appear in the same game. So because of that, Diamondback shouldn't be in Halo 3. Instead, it could either go into Halo: Reach, Halo 4, or perhaps maybe be one of the multiplayer maps that's playable at launch or in a DLC in Halo Infinite. Yeah I know Diamondback looks different from Avalanche in terms of location and environment but it has a duplicate layout of Avalanche. So please no Diamondback in Halo 3. All the other original maps of Halo Online are welcome into Halo 3 and Dry Dock is also welcome as well.
Let's not bring Diamondback to Halo 3