Would just like to point out when viewed in the tank there is no yellow at the back end and the white band on the caudal fin is blue.
Think this is camera error or different lighting conditons in different parts of the tank.
The Julidochromis group is very muddy, but that seems more like a pale Transcriptus Pemba, especially if they stay small. The problem is that you don't know if pure, or just F11. A third lower line on the jaw is supposed to what Marlieri show.
Could be a mix of the Pemba and Gombe, since both have been called "Transcriptus" in the hobby. Are you trying to decide which one, is that what you mean? The faint line on the lower jaw is the mystery.