chidori nagashi is like a weaker version of raiton armour,gaara's sand didnt budge in the least when it stoped a v2 kick which gave out tailed beast levels of chakra,so CN isnt helping.
Stop comparing CE and SRA gaara,their defence is not the same,SRA gaara is leagues above CE gaara,bone drill would easily pierced CE gaara's sand sphere,SRA gaara is a lot stronger than that. Kimimaro beat up the entire sound 4,wheras sakon beat sasuke,kimimaro brushed kn0 naruto aside in base,and that naruto was stronger than the one who fought gaara in the CE,so obviously their levels are far apart, also kimi's bone drill dosnet just pierce,it actually starts to DRILL through,it's a lot more than just simply piercing,that thing had more piercing power than sasuke's chidori and gaara blocked it.
For the last time chidori barely pierced the dome much less like butter and his hand got stuck,he just gave gaara a wund more resembling a sratch on his shoulder
How is sasuke even getting close to use a chidori on gaara anyway?,also sasuk cant see through the dome orbehind it,thus gaara can jus keep a sand clone within the dome,while sasuke hits the sphere,gaara just uses the entire dome to impale sasuke.
Breaking open a cave?whats so powerful about that?:|. Any of the clones can do that. Gaara also restrained the v3 sunoo of madara himself,sasuke's v4 susanoo isnt of at all that much above madara's v3. Also the amountof sand gaara used to block the v3 and restrain the susanoo were quite small and he wasnt even looking when the blocked the susanoos,and had to use lightened(and such weakened) sand to restrain the ssanoo,here if he uses more sand,then he has no problem.