1.Kishimoto stating Hinata makes a better heroine is also said to be a mistranslation.
I did a search and he does say "Honestly, from the standpoint of showing a female-like disposition she hasn't been much of a Heroine.You could even say Hinata is more of a heroine than her. But since, as we know, Sakura is a Heroine deep inside she'll show that side of hers from now on"
But later on he also says "Since Sakura is the heroine", "I'll be writing from now on to show her with that disposition"
"Though everyone says Hinata-Hinata all the time..."
Now one would question if Hinata really would make a better heroine. Depending on your view, yes and no. A heroine is noted for her courage and daring. Hinata showed so when she moved to save Naruto. Yet in the war she is shown to still be independent on Naruto, having shown self-doubt when a hero/heroine is someone you look up to for strength.
As for fillers. No, NONE of them happened. Fillers are just that. FILLers. They are there to fill the long wait while the mangaka makes new chapters and that the anime won't catch up and "overshoot" the manga. If fillers happened we'd be wondering why it contradicts the manga and vice versa.
2.Naruto ignored Neji and other Shinobi because they weren't actually in the same situation as Hinata. Hinata had three Zetsu ganging up on her and the others weren't in any danger. Even if it was true don't you think Naruto saving someone else and ignoring other comrades in danger is extremely unheroic-like? And even more so completely against Naruto's character. Lastly, Naruto telling Hinata everything is OK can be normal friend talk, especially since events were looking bleak and Naruto's intention was to aid his comrades.
3.Proving Sakura still loves Sasuke does not prove NaruHina. We still have scenes to suggest Naruto's own feelings for Sakura and so far there's nothing to suggest he's leaning towards Hinata.
4.Naruto lost control because a friend died before his eyes, piled along with Kakashi dying, Fukasaku dying and the destruction of the village. Hinata was the "last straw". Naruto would do it for anyone in Hinata's situation (albeit without the confession, of course). Whether it be Sakura, Ino or Shino or whoever. You shouldn't shit on Sakura for "obeying Naruto like a dog" when a) Naruto wanted everyone out of the way so they wouldn't get hurt. b) Sakura had no idea what was going on until a Hyuga told her too late c) Sakura, as a medic, has a job to heal the injured. A Shinobi should not put personal feelings in their line of work. Lastly, Naruto got filled with relief when he found that
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and the rest of the
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were alive. Not just Hinata.