IMHO - you are taking a huge risk with the EBs. If you don't keep the larger fish, especially the regular JD, fed well the EBs will become food. I have seen it happen.
If the EBs get to subadult/adult size they will never become dominant and are likely to be lighter in color and pushed into cover by the larger JD and other larger cichlids.
Good Luck, but be prepared to lose them.