I'm crying as I read this

You have a responsibility to your nine first and foremost. You have a huge heart to welcome Mr. Magoo into your home and give him all these chances. I agree with the fact that if he was just aggressive toward you, you should work through it. But since it is toward your babies, I understand your heartbreak

There are things you could try, but when it comes down to it, one of your cats could get seriously hurt in the meantime. I think you will find the answer in your heart. Whatever you decide to do, we know that you have made that decision with the best intentions for Mr. Magoo and your other 9 babies.

At least now that he has been in a home environment for a little bit, it will be easier to match him to another home if he goes back to the shelter. Since he's special needs and likes to bite, he may do well as an only-pet.

Keeping you in my thoughts. Stay strong. No one will judge or second guess your decisions. We all know you're wonderful!