I know exactly what you mean. This was actually one of the characteristics that made me first lean towards a C. amber. Now knowing that is a slim to none chance. But, things like this is why it took so long to properly I.D. them. My other female crypticum is very typical in appearance. She was an easy I.D. from the beginning. This girl took some time and many eyes that have field experience in Mada to help me I.D. her properly.
I now think the brevicorne-clade is very interesting. New results were being explained to me as how the same species can have different prominent characteristics from one area to the next. Plus, they are so close in appearance in some instances. But I was told that genetic testing is the next step in really pushing forward in figuring the brevicorne-clade out. Very cool stuff.