ANALYSIS: One of the notable changes the past two weeks has been at defensive tackle, where veteran Isaac Sopoaga has been a healthy scratch and rookie Joe Vellano is playing limited snaps. That has left Sealver Siliga and Chris Jones as the primary tandem and they are accounting well for themselves. Siliga had a team-high nine tackles and one sack and forced fumble on Sunday. ... For the second straight week, rookie Logan Ryan started at cornerback opposite Aqib Talib, with Kyle Arrington the third man in. ... Ryan, Talib and starting safeties Duron Harmon and Steve Gregory played every snap but one which came in the goal-line package. ... That left defensive ends Chandler Jones and Rob Ninkovich as the only defenders to play every snap. They are the constants. ... Cornerback Justin Green's one snap came as an injury replacement for Arrington and he had tight coverage on an incomplete pass in his direction. ... Defensive end Michael Buchanan's one snap came as he entered in the nickel and was ultimately trailing in coverage on running back Fred Jackson's 37-yard catch-and-run. ... Safety Tavon Wilson's two snaps came in the dime package as he entered as the sixth defensive back. ... There was a little more of a liberal substitution pattern with the top four linebackers as Dane Fletcher (17 snaps) played more in nickel than he has in past games. He's mostly been the team's lone dime linebacker.