Tracing Business Acumen to Dyslexia

"She attributed the greater share in the United States to earlier and more effective intervention by American schools to help dyslexic students deal with their learning problems."

Couldn't the reason dyslexic people become entrepreneurs rather than "corporate managers" just as easily be because they don't do well in school, and thus don't have the same risk/reward profile due to fewer opportunities being available to them? Same thing with immigrants, they don't have the credentials to get the jobs they're qualified for so they end up starting businesses in hugely disproportionate numbers. I think something like a third of all new jobs are created by immigrants.