HOUSTON — Facing rampant unconfirmed speculation about his job security as the Houston Texans careen toward a losing season for the first time under his tenure, head coach Bill O’Brien made it abundantly clear that he has no plans to walk away. If Texans owner Bob McNair doesn’t want O’Brien back, he’d have to be fired.…

After dramatic drop off, embattled coach makes firm statement on his NFL future Justin Edmonds/Getty Images

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