The thing is, who other than Sakura could be the special female character ? A character that he forgot to insert in the manga ?
A special female character has to be shown that she's not like other female characters. Who else could it be beside Sakura ? 
If Kishimoto really didn't care then Sakura would not have hundreds of panel time and some good development from the first place like the side characters. She went everywhere with the protagonist, had hundreds of panels, good development ( before her character assassination in the last 2 chapters along with other characters ), battled and showed huge strength many times.
It's called heroine. She's the heroine according to Kishimoto in his main characters list, the data books and the manga.
Sakura did cut out of appearance at some point, but we all know the drag of the war against Pein, the alliances arrival is a big drag, Naruto and Kakashi boys fight with Obito and Madara, etc. In fact, Sakura has more appearances than Sasuke and what she's doing in the story. She comes second after Naruto in these terms.
After all this and what I was reading for years, if Kishimoto meant that Sakura is not a special female character and it's another one, which there's nowhere else in the manga to be seen of such character, then I'm kinda stunned of passing one of grade school's simplest question : " Who are the main characters of this story ? "
Edited by T XD, 01 February 2017 - 01:05 AM.