who wouldn't run from 2 kages, he was going to die if he continued the battle against A and Gaara not to mention he had to deal with the other kages. And Sasuke vs Gaara 2 isn't from the start and he already used a chidori and that's 2 tomes not 3. Sasuke might have beat gaara if he didn't wait until he was out of chakra to use the curse mark level 1. Look how he destroyed zaku and got both naruto and sakura out of harms way according to dosu in an instant. Dosu was terrified of him and he was willing to go after gaara with no fear at all