Actually, he mentioned it himself on the July 5 episode, when he was talking to Claire about them dating. He was grateful to her for treating him as "normal". Theo is a highly functioning autistic person. They have shown him getting special therapy, lessons, etc. throughout his life. Actually, his story was written as Dena Higley has an autistic son, who also is highly functioning.
Recently, I wonder about Brady's heart transplant...in his daily life, he never seems to worry about taking meds. And he has to be taking anti-rejection medication.
Then, there is also the fact that both John & Steve live with just one kidney, Steve donating one to Jack, John having had his stolen for Stefano. I guess both are fine, though.
and then there is Maggie's restaurant, and her health spa she bought from ...Quinn? and Victor's club, that Belle bought so Claire would have somewhere to sing and hang out with friends. Yep, Whatever happened to them all.