Gaara and Tsunade win low-mid difficulty.
Current Gaara would solo high difficulty, with Tsunade's help, this becomes a stomp.
Most of Team 2 has nothing that can get past Gaara's sand except raikiri. Even still, Kakashi has to go up close to Gaara to use it but Gaara won't let him. He'll bombard Kakashi and the rest of Kakashi's team with large long range area of effect attacks. In the mean time, Tsunade can pick off Hidan and Asuma. The mist is rendered useless in Gaara's case because he can utilize sand sensing while Tsunade has shown the ability to listen to heart beats. As a matter of fact, Hidan and Asuma become useless in the face of hidden mist so it will end up hurting their team.
Tsunade and Gaara can also take it to the skies or hop on to Katsuyu so they have a major safety net.