MasterSafara
Super Freak
Being born in the darkness could very well mean, and likely does, (though you can't be certain) he was born in the pit. It could also mean he was born in a room and someone forgot to turn the lights on. One is more likely than the other but no one can say for certain. Neither take away from the story or the character though. The twist just reframed the myth the audience had only assumed from 2nd hand knowledge from the likes of Alfred and the prison dr. It revealed that Talia was the child and revealed that there was more to Bane than just the devil.
This is where you fill in the blank. Since all we know from the script is that Talia had a protector down in the pit and Bane saying he was born in the darkness as well as Alfred digging up Banes origins "he comes from" the pit we are offered no other explanation of Banes origin. It's the script. Just pointing out the script.