I don't see how people can compare Jiraiya's relationship with Naruto to Oro and Sasuke. Jiraiya wants to train Naruto as an apprentice, great, Jiraiya sees potential, and a little bit of himself in him. Oro wants Sasuke's body so he can change bodies when his current scary woman body is useless. That's not what I call apprenticeship. Furthermore, Tsunade hasn't even met Sakura. I for one can never imagine the two getting very close.

If you want to talk foreshadowing, compare Naruto to the fourth, Sasuke to Itachi, and Sakura to her non-existant parents who weren't even shown fighting (if they were) when Konoha was attacked. You can call that foreshadowing, you see everyone's parent, minus Sakura's, which has to mean something (i.e. she and her family have virutally nill talent as ninjas) From there you can kind of see people's potential's and maybe even their futures. Ino Chouji and Shika all have a pleasant future, Neji and Hinata are going to rock, but Sakura doesn't seem to have anytyhing.

Now don't get me wrong, I am one of the few who likes her character, and I would like to see her play a bigger role, I just don't think it's gonna happen like that.