In my book Nero is a sweety even if he doesn't perform all the rooster duties, I much rather have a "lovable" rooster than an aggressive one. I strongly advise you to get more pullets for him. I'm exactly in the same situation you are, my Caesar has three pullets and eventhough he doesn't mount them too often, he is rough so I'm getting 3 more pullets for her and in the mean time I'm waiting for the delivery of her saddles for his girls.