FALLING

1. Mike Sims-Walker, ex-Rams WR: That did not take long. Sims-Walker went from key free-agent addition to dropping three passes against Washington to being named inactive to being released in a short period of time. Perhaps now we know why the Jacksonville Jaguars decided against bringing back Sims-Walker even though they lacked proven players at the position. Sims-Walker was the logical Rams receiver to go once the team acquired Brandon Lloyd from Denver. The team expects to welcome back veteran Mark Clayton from the physically unable to perform list at some point, too.

2. Lockout grace periods: It's tough for the San Francisco 49ers' division rivals -- and other teams -- to complain too loudly about the lockout setting them back. The 49ers have gotten to 5-1 despite changing over just about all of their coaching staff and installing new schemes. As Arizona Cardinals president Michael Bidwill said following his team's 1-4 start, "A lot of guys are making mistakes. Can you say, 'Well, gee, that is lack of offseason?' We're now into October. We now should be able to clean up those things. These are professional athletes and they have to rise to the occasion. And none of the other 31 teams had an offseason, either. We shouldn't be at that much of a disadvantage where we've only won one game."

3. Shawntae Spencer, 49ers CB: Spencer was a starter last season and arguably the best cornerback on the team. He's not getting on the field at this point because Carlos Rogers, Tarell Brown and rookie Chris Culliver are ahead of him on the depth chart. The 49ers did a good job addressing the position in the offseason. Had they stood pat, Spencer would probably be starting. Injuries have also set back Spencer this season.

RISING

49ers linebacker Aldon Smith is making a case to become defensive rookie of the year. AP Photo/Rick Osentoski

1. Aldon Smith, 49ers OLB: The player San Francisco drafted in the first round is quickly becoming a candidate for defensive rookie of the year, along with Ryan Kerrigan of the Washington Redskins. Smith has 5.5 sacks over the 49ers' last three games. He is playing well and benefiting from the talent around him. Opposing offenses must funnel additional resources toward defensive end Justin Smith in particular.

2. Vic Fangio, 49ers defensive coordinator. The 49ers' defensive performance on the road against the Detroit Lions was mostly dominant. The defense provided a safety and held the Lions to two third-down conversions in 15 opportunities. Fangio and the personnel department deserve much credit for putting together the right mix of players on defense. Drafting Smith seventh overall and Culliver in the third round helped the defense right away. Other moves that have worked out well: adding Rogers to replace Nate Clements, moving NaVorro Bowman into the lineup at the expense of Takeo Spikes, signing and moving into the lineup Ray McDonald and remaking the safety position without losing Dashon Goldson. The 49ers took some heat for not signing Nnamdi Asomugha, but no one is complaining now.

3. Delanie Walker, 49ers TE: Walker now has touchdown receptions in consecutive games. He has three for the season after catching none since 2008. Years ago, when Trent Dilfer was still playing for the 49ers, I remember him saying Walker was one of the most talented players on the team. Year after year, Walker seemed on the verge of becoming a bigger factor, but it would never happen to the extent anticipated. It's looking like the new coaching staff is finding ways to get more key plays from Walker. His game-winning touchdown reception in the final minutes Sunday stands as a career highlight, but perhaps not for long.