I was so confused about them until the end. xD I didn't get all the voxophones to put it together myself that they were the same person until the end. I loved the parts with them in it. The way they talked was so fun. I love riddles. =)
Robert - "The only difference between past and present..."
Rosalind - "is semantics."
The game is MEGA gorgeous. Aesthetically speaking, it was... WOW.
Also, check this out.