onoki>A>tsunade>gaara>mei
however, in a desert gaara would be higher then tsunade
You do realize that A and Tsunade are both taijutsu only fighters, with no long ranged jutsu in their arsenal.
Gaara can fly.
Nothing A, or Tsunade can do would touch Gaara unless Tsunade summons Katsuyu, which Gaara can easily,
easily drown in Sand Tsunami.
Being in a desert would matter not to Gaara, he can create sand from anywhere. As we observed in his fight against Kimmimaro.
Gaara is now stronger, and could create an even more vast amount. The only person who would give him somewhat of an issue would be Onoki, but since Onoki has to be stationary for him to get a Jinton off, he won't land one on Gaara.
Even if he does, dat absolute defense.
Gaara takes them all 1v1.