This is my usual weekly installment of "Stock Watch." On Wednesday afternoon, ESPN.com will run a team-by-team "Midseason Stock Report" that reviews the first eight games and looks ahead to the second half of the season.
FALLING
1. Patriots' run defense: Browns running back Peyton Hillis left cleat marks all over the Patriots on Sunday. He rushed for 184 yards and two touchdowns. Quarterback Colt McCoy and receiver Chansi Stuckey also ran for touchdowns. Patriots nose tackle Vince Wilfork is one of the NFL's great run-stuffers, but the Patriots rank 21st defending the ground.
2. Chad Henne, Dolphins quarterback: In an ugly loss to the Ravens, Henne threw three interceptions and no touchdown passes. The Dolphins were forced to kick a field goal after Henne misfired badly on a point-blank toss to tight end Anthony Fasano in the end zone on third-and-goal. Over the past three games, Henne has one touchdown and five interceptions.
3. Bills' pass defense: The Bills had a glorious opportunity to make plays against a mistake-prone offense. The Bears lead the NFL in sacks allowed. Bears quarterback Jay Cutler threw four interceptions his previous game. The Bills recorded zero sacks, just one quarterback hit and zero interceptions in a 22-19 loss.
RISING
1. Darrelle Revis, Jets cornerback: His contract squabble and subsequent hamstring injury kicked open the door for criticism. Revis clearly wasn't healthy enough when he returned in Week 5. But he looked superb in limiting star receiver Calvin Johnson to one catch for 13 yards.
2. Ronnie Brown, Dolphins running back: It's not his fault the Dolphins stopped giving him the ball. On the first two snaps Sunday in Baltimore, he rushed for 12 yards and 14 yards. He polished off the opening drive with a 12-yard touchdown run. Brown had six carries for 45 yards on the series. He ran once more in the first half, twice in the second half.
3. Nick Folk, Jets kicker: He had a costly miss in the Week 8 shutout loss to the Packers, but he was perfect in Sunday's rollicking comeback victory in Detroit. Folk sent the game into overtime with a 36-yard field goal as the fourth-quarter clock struck 0:00. He added a 30-yard field goal in sudden death.