SAN FRANCISCO – The San Francisco 49ers will continue to be without two All-Pro defensive players Sunday night against the Houston Texans.Inside linebacker Patrick Willis is inactive and will miss his second straight game with a groin injury he suffered in Week 3 in a loss to the Indianapolis Colts. Willis worked out on the field Sunday and met with team physicians. Clearly, the team felt it was too risky for Willis to play. Michael Wilhoite will start for Willis as he did in week 4 against the Rams.