Re: who has "grown" the most?
I say Sakura has grown the most. Its plain as daylight that when you compare her now and before the time-skip the magnitude in which she has developed, strength, courage, and skills, that's a lot for single person to do in three years time.
"Inherited will, the destiny of the age, and the dreams of its people. These are things that will not be stopped. As long as people continue to pursue the meaning of freedom, these things will never cease to be!"
-Gol D. Roger