Karin would work better with Scarlet than Kabuto would imo. Chiyo works with all so you could keep her, however if you've got 3 stars Sasuke then replace Kakashi with him for a better combo.

if i have Kakashi 4*, is he better than Sasuke 3* ?
in other hand, is this team really good ? "kabuto,chiyo,scarletblaze,kakashi and kabuto and chiyo will be at the back and at the front is kakashi and scarlet blaze"