Spocks story in the first movie was relatively equal, but the second movie makes Spock secondary with development.
Oh, good grief -- you haven't even seen the damn movie yet!
So obviously you can't actually know that. This conversation is a complete waste of time.
It's not a huge leap...Kirk's story superseded Spock's by the end of the first movie, despite relatively equal time. As I said, both ad campaigns centered on voiceovers of Kirk's story, usually by Pike. As for STID, Spock has some moments in it of course, but it is Kirk's vendetta, Kirk that makes a prime directive mistake, Kirk that is the one who needs to grow and learn(per Pike). I don't need to see the movie to realize this.