Oh, Jules. I am so deeply sorry for your loss, sweetheart.
You're probably right about his genetics, because the care and love you gave him were of the highest caliber. He wanted for nothing, and he couldn't have asked for a more caring parront.
I know you would have wanted to be there for him in his final moments, but what is far more important is all the time that you spent with him while he was here. That's what gave him the quality of life that he so enjoyed. You enriched his life even as he enriched yours.
Sir Twigs, your spirit was always far bigger than the body that housed it. So spread those wings as wide as you always envisioned and fly free, sweet bird.