I will add to this when I can be bothered.
For now though,Gaara owns Sasuke in this video. This video is not game footage,nor is it just there to promote the game.
Kishi said he wanted to make more of certain fights to shed light and add depth to the characters we don't see enough of.
Like it or not,These videos' + the link to the anime I sent,both show Gaara blocking Amaterasu without issue.
None of these things get made without Kishimoto's approval,if you don't like what he's chosen to do with it,then take it up with him.
I have just shown video's which he and studio Pierot released. The content is clear.
Re Sasuke's Chidori: I have no real interest in what is stronger,simple Chidori or Chidori blade. It would appear that when Sasuke attacked Raikage with his blade,he had charged it with his Lightning nature,which did nothing.
Then Sasuke used Chidori which is a more piercing attack & it is more focused than a chakra infused blade. So I will consent that Chidori>Chidori Blade for whatever reason.
This being said,Gaara stopped the blade and easily halted it when it was charged with Lightning. Gaara in this video,was at best unimpressed/unphased by Sasuke's offensive skills. Even when the Blade was an inch from his face,he remained calm & confident. The Raikage had his armour at 100% and was ready for a war,Gaara was just defending and pushing Sasuke back.