VictimOfFate said:So Rakka first thought of the town as something like a paradise and felt betrayed when she had to suddenly face a dark side of the existence of Haibane through the suddent departure of her friend. In her shock and depression she is not able to accept the existence as Haibanei, which is the requirement to reach Day of Flight, so the evil influence of her self-loathing that goes against the intended nature of haibane has her marked as sinner, a failure, and her feathers start turning black.
The darkening of her feathers signifies to her that her existence is somehow flawed and unacceptable. She already carries the assumption that she should not exist from her life become becoming a Haibane. That's also why Kuu's death hit her so hard. Inability to save her made her question whether her existence has any purpose if her happiness is so fleeting, so her earlier depression re-emerge. Now it makes sense why she thought if she "deserves to be this happy" in a previous episode.
And just when I started thinking I understand why Haibane become sinners and what they need in order to reach their day of flight something completely weird like this is thrown into the mix. The crow corpse at the bottom of the well. From how Rakka interpreted the situation it seems crows can carry some sort of message from the other side of the walls.
It's symbolically significant because it means the acceptance she gets is not only from being revered by townspeople, but a personal message from her past in a world where evil exists. Only Rakka can interpret the crow's connection to her. Just being able to realize that the crow came to support her means she was able to get over some of her self loathing. If she still hated herself she could not interpret ANYTHING as a sign of acceptance towards herself.
On top of that, if it's a message from her past only she can interpret the message of the crow. Hell, it could be the crow was just a random bird and Rakka used it just to give some form she can bury to her conflict. But if the crow actually carried thoughts that were already a part of her existence but that she had separated from herself and she needs someone else to give her back, the crow is just a sign of acceptance from someone who was close to her. To put it bluntly, she got therapy
I have five theories for what/who the bird at the bottom of the well is
1) It is Rakka. All Haibane are actually crows who wanted to live with humans but could not because they are deemed scary and they cannot communicate with humans (Kuu's thoughts from a previous episode)
2) It's the crow from Rakka's dream. Rakka was a crow back then, but she became a Haibane when she was about to die from the fall. The crow who tried to stop her from falling became exhausted and dropped at the bottom of the well and died there.
3) It's Kuu. She became a crow at the Day of Flight and wanted to come see the others again. However, she fell hit a tree and fell in the well or something and died. (I hope not)
4) It's just a random crow.
5) The dream was entirely symbolism. The fall was Rakka's suicide. The crow was a friend or family member of Rakka who mourned her death. Trying to pull Rakka up was to give Rakka's life a purpose by mourning for her death. When Rakka was alive she wouldn't have been able to accept it as genuine feelings (stop pitying me) and died thinking she had no reason to be in the world. The person actually took the form of a crow much like Rakka took the form of Haibane and delivered the message. Because the one who delivered the message actually died Rakka accepts the emotions as genuine.