Board Thread:Theories and Speculation/@comment-27821571-20160915183730/@comment-1751565-20160921141618

Gaara was born with Sand Control, since he was born with Shukaku... don't forget it was sealed in him from the womb. According to Kishimoto, once its ingrained in you, you cant lose it. Karura's Will relies only in his Sand Shield (the Sand he carries in his Gourd), it moves to protect him because of her- Gaara has no control over that, not unless he is using it to attack etc. If you read the Gaara Hiden book, it goes into some moe detail exactly how the techniques work, and gives you a better idea.