It sounds to me like the author is indicating that people with the "high-context" don't just jump in. If they make their own changes to the code, presumably they'd not attempt to get them merged (due to distrust of others or distrust of self?). They need a soft and gradual introduction into the development community and the group of people that work on the project regularly before they feel comfortable enough to submit patches and interact in otherwise meaningful ways.

That's what I took from the article. It's an interesting problem.