You want sakura to get stab?Excuse me but I have to say this:
Kishi put Hinata in the middle of the so awaited Naruto x Pain fight. Why wouldn't he put Sakura in Naruto x Sasuke? I mean, if your argument is about the relevance of this battle for the story, let's take in consideration the relevance of the characters. If Hinata, HINATA, did something in Pain vs Naruto, it would be no surprise having Sakura doing something in this battle.
Well welcome to the club ^^