Alot of your points make sense, it's just that you don't go fully in depth or else you'd notice that Sasuke has a canon manga scan to negate every single one you've posted. First of all:
Gaara's answer to Amaterasu: Gaara managed to block direct Enton strikes that were launched at him from the front. Sasuke however, has far more deceptive means to connect with Amaterasu.
From coating an arrow with flames so that it can pierce through his sand defense and hit him, ignite his clothing if he manages to dodge.
From coating his own Susanoo in flames before crushing through his sand defense guaranteeing he grabs him with his flames. If he can slam through stone pillars he can slam through his sand defenses aslong as it's not a particularly large one.
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From shooting an Amaterasu that he's forced to block before he fires an arrow right behind it (the speed is too much for Gaara to defend against as Gaara's one of the slower ninja in the manga).
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Too fast for a Sharingan to trace? So fast it took Kamui to defend against? Gaara's incapable of dealing with that level of speed.
Counter to Genjutsu: This one is 100% wrong based on what's been shown by both characters. First of all, against Madara Gaara made no attempt to avoid eye contact. Secondly against Niidaime Mizukage, once he was caught in his clam's Genjutsu he made absolutely no attempt at escaping it (leading one to believe he simply couldn't). And lastly, look at Deidara's range when he gets hit by a basic confusion Genjutsu:
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Starting range...
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Still running...
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Right... THERE. See that tiny dot? THAT'S how far away Sasuke was when he caught Deidara with a Genjutsu. To claim that close range is necessary for it to work you'd have to ignore this scan.
See what I mean? You don't just look at what Gaara's done to make your case. You have to look at Sasuke's aswell.
VS 5 Susanoo: Literally all of this fight was off panel, and once he was actually shown fighting against them he was getting ragdolled. And this was against an opponent who was toying with him no less. This is hardly a point you want to bring up in Gaara's favor, lol.
Counter to Chidori: The difference between your two scans is that you assume Sasuke's Chidori hits with the same force as Raikage's leg drop, when that's simply false. Chidori relies in speed to add to piercing power while that leg drop was little more than a hop. It wouldn't have had the same destructive force as a focused full speed Chidori. Even more proof of Chidori's superiority?
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He just pierced through Raiton armor without full speed. They're both of the same element and should have canceled eachother out. Actually no, the armor should've defeated the Chidori outright because it's powered by Bijuu-level chakra. Instead Sasuke succeeds. But none of this is the real reason why Sasuke's raiton will allow him to tear down Gaara's sand...
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Chidori Eisou... let's say it goes through the armor, but misses Gaara due to him moving to the side... what then?
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BAM. Suprise pin cushion attack! No sand defense, and AoE equals dead Gaara.
So once again: Gaara is not superior to Sasuke. When it comes to strength I'll agree, his power overall is greater than Sasuke's on a sense of scale (i.e; he can crush a village under sand). But in a one on one fight, unless Gaara and Sasuke are fighting in a desert Sasuke has every tool to decisively defeat Gaara in every possible situation. In the air (hawks, enton, Genjutsu). On the ground (Susanoo arrows, enton, Raiton, Genjutsu) at long range (Genjutsu, Enton) at close to mid range (Genjutsu, Susanoo, Enton, Raiton).