If you read the whole story, you will see that EVERYONE is right.
Yes, Ottis Toole was the primary suspect.
Yet, there seem to be several reasons to have doubt.
Once the police ‘solved’ the case and got the media off their backs, they were reluctant to accept any info that would cause them to lose their ‘hold’ on the prime suspect.
The WHOLE article is worth reading.
I read the article. I am fully aware that there is some doubt about who killed the poor boy. Then again, there is still some doubt about who killed John Lennon (personally, I think the Chapman kid did it; but, who am I to judge, eh?)