It's not something that Lex planned or that the audience may have known or have hints about in the future like sometimes happens in episodic television. This is a complete surprise for everyone. And I literally didn't know who it was until I read the script. I actually thought it was between two different people until I read the scripts. And I was right, this person was one of those two people, but I didn't know for sure.
To me, from the beginning, this show has always been about Clark before Superman. And for me, flying then brings you into the realm of Superman. I find it much more interesting to concentrate on the development of this character and show you what happened in his life to make him become this Superman that we all know him to be.