So, Simon gets to stay. The vet checked him out, and other than some ear mites, he is in good shape. Nothing that can't be cured. I have to keep him separate from Ward & Hubert for now till the ear mites are gone. And I was able to convince my landlord to let me keep him! So he gets to stay! Woohoo! Although he currently has to live in the bathroom till the ear mites pass. But I let him out every evening to give him a chance to stretch his legs & explore his new home.
He is by far the sweetest kitty ever. And he is still a kitty. The vet said he was maybe about 8 months old. And he is super affectionate & cuddly & would be completely happy if I held him every minute of the day.