I think it be would best if you just get his frags to upgrade him to 4/5 star. You can get 26 of his frags and over time you should be able to get the other 80 and 4 star him. He's okay at the moment, good for Jinchuriki's but the only two we have are Naruto and Gaara. Regular Naruto is currently outclassed, thus you will want to use Sage, and Gaara is difficult to get to 3 star if you didn't recharge for him and didn't get the KazeKage Version. But if you're running wind main and have those two, then it's nice to have Killer Bee.