HOUSTON (AP) — The Houston Texans know they'll have a solid defense led by J.J. Watt. As they reported for camp Friday there were far more questions about the offense. Second-year coach Bill O'Brien will use camp to decide whether Brian Hoyer or Ryan Mallett will start at quarterback. Houston also must decide who will start with DeAndre Hopkins at receiver after franchise receiving leader Andre Johnson was released and signed with the Indianapolis Colts. They also have changes one their offensive line after releasing veteran Chris Myers, who had started the last 112 games at center.