SANTA CLARA, Calif. -- It would be silly to say the San Francisco 49ers do not miss Aldon Smith.Smith, who hasn't played since Week 3, has 38 sacks since entering the NFL in 2011. It leads the league. Smith has missed the past three games because he is in an alcohol treatment center. There is no timetable for his return to the field.Even though the 49ers would be better off with Smith, they are still creating a strong pass rush.According to ESPN's Stats & Information, the 49ers have generated tremendous pressure with a four-man rush.