your current team is fine, if you want a healer, get kabuto from the exchange shops

Replace Kabuto with Kakashi and u will have a very good lineup:)

Is Kabuto really good? or is it just because he's a healer?

I recently upgraded my Sasuke to 3 stars, would that need me to change my lineup?

I tend to look at it this way: Sakura is good for group healing, Shizune can poison and comes in at three stars. As others suggested, if you're willing to make the effort, Kabuto is another option, both because of how much he heals, and his clones. I've been using Shizune just because she's the strongest healer I have, but how little she alone heals leaves much to be desired.

Replace Kakashi with Shizune and boom, you got yourself a 8/9 hit combo plus the poison of shizune and her heal, in my opinion Shizune is better than kabuto and karin because she dispells 2 debuff.

Definitly upgrade ur sauske and hinta. Just sweep the elite instances definitly help with ur power level and *. Kabuto is nice or u can even get great ninja war kiba instaed of kakshi.

I have used a very similar lineup, although i placed the main character second rank bottom, hinata first rank middle, and kakashi third rank middle. if you keep this lineup, you might want to use either the special anbu tactics, or the lightning ninjutsu buff. along with the passive skill that attacks knockdowns. but, i have also been looking for another lineup.

I think test your advice in the test arena thanks :P