That's why I'm pretty curious about Chris age 5-10. There's no reason not to believe Chris was nonverbal till he was 7, but I'd love to see some paperwork to back that up. IIRC even Cole backed that up.
I mean, a nonverbal autist suddenly speaking after 7 years is damn near miraculous, I could see how for Borb it would be touch and go, maybe wondering if stressing him out will make him stop talking again. So, they spoil him. Hell it worked right? And they do everything to remove stress from his life. They don't challenge him. Then ten years go by and Chris is 20 and won't shut the fuck up AND he's used to being spoiled and not stressed.