Responses
First thing first I would like to apologize for my english if there's something wrong
So as you can see Satan is at the bottom and Beelzebub is at the top. Bottom can represent hell and top can represent heaven. Beelzebub is at the white background and Satan is at red.
Next thing is feathers. In the newest chapter it was revealed that Beelzebub become an angel so they could be his feathers.
It's my opinion and it makes sense to me but if you have different opinions then please tell me.
Look at the cover...
I just realized the foreshadowing