The 49ers are again without a true fullback today after letting David Kirtman go and signing a tight end, Sean Ryan. The 6-5, 260-pound Ryan has bounced among four teams since being drafted by the Cowboys out of Boston College in the fifth round in 2004. He played in games for both the Dolphins and Saints earlier this year.
Kirtman replaced Zak Keasey on the roster after Keasey was placed on injured reserve with a torn biceps. Kirtman's only action came on special teams last week against Seattle. With Keasey out of the lineup, the 49ers mostly have compensated with two tight-end formations. The teams' original three tight ends, Delanie Walker, Billy Bajema and Vernon Davis, all have lined up in the backfield at times this season. Davis was Frank Gore's lead blocker on a 29-yard run in the second quarter against the Seahawks.
-- Matt Barrows