First off, lets not open threads to cause problems, contact people and find out what is really going on before posting a thread on here.
The Luna Theme theme I made is an update.zip and to understand most themes in this format they simply replace a bunch of system apk files. Now, people don't understand how themes work so they apply a theme for 2.0.0 to 3.5.0 and most of the time yes, it works, however you might notice small issues, displacements, or just different functions in apps. Now, because you put my Luna Theme on your Sapphire ROM, this doesn't prove that BD is stealing code but rather just shows that your phone is now in a hybrid. For the most part just images have been replaced, but also parts of apps are changed for you now. For example, I don't believe that your sapphire MMS app has a black background option (if i remember correctly) but now that you replaced the MMS with my Luna version, it does have that option.
By installing my update.zip you are just pushing a few regular APK files to your phone that replace your originals. The only thing people have issues with usually is the framework-res.apk and services.jar files... And I don't know enough about Sapphire or eXtreme or those technicalities to comment on that.
EDIT: Also, I believe I will be porting over my newest build of Luna Theme to Sapphire in the coming days, so keep in touch and stay tuned in...