Yeah i remember when Kiba and four tails crushed Rashomon with ease, nuff said. I have to for Shinra Tensei cuz it can block almost everything except for Ramen guy.
Gaara's Sand shield blocked a Raiton Armor kick. Gaara's jutsu is classified as a short range,defensive jutsu. Kekkei Genkai are "Bloodline Limits" Gaara's shield isn't in his blood, its a jutsu he had grew up with and has grown used to it. Just because he is the only one to use it doesn't mean it's a Kekkei Genkai. I hope my evidence is enough