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Garett Bolles learning on the job as leader of Broncos' rookie class

Here's a look at the first-half impact of the Denver Broncos draft class:

Garett Bolles, T, first round: Bolles was put into the starting lineup in training camp and has showed the athleticism worthy of his draft status. But he’s found some tough sledding, as expected, against pass-rushers such as Melvin Ingram and Justin Houston, and will need to bounce back more quickly from difficult plays over the long haul. Grade: Above average.

DeMarcus Walker, OLB/DE, second round: This is a player who had 26.5 sacks in his last two years combined at Florida State but was inactive for the Broncos' losses in Kansas City and in Philadelphia. He's learning a new position at outside linebacker, so that's hindered him some, and he won't get in the lineup more until he's better on special teams. Grade: Below average.

Carlos Henderson, WR, third round: Henderson fractured his hand in the preseason and went to injured reserve when rosters were trimmed to 53 players just before the regular season. He would have likely found a role on special teams, but it was clear he has some work to do in the offense. Grade: Incomplete.

Brendan Langley, CB, third round: Langley is a big cornerback (6-foot, 199 pounds) with elite speed, so the Broncos like his upside. He's played in six of the eight games and has become a regular on special teams. Grade: Average.

Jake Butt, TE, fifth round: Butt was on the non-football injury list -- he tore an ACL in his last game at Michigan -- for the first eight games of the season, but after he had practiced the past three weeks for his potential addition to the roster the Broncos thought he still wasn't ready and moved him to injured reserve for the remainder of the season. Grade: Incomplete.

Isaiah McKenzie, WR, fifth round: McKenzie was named the team's top punt returner in training camp and has had some spot duty in the offense. It's clear his speed could have an impact, but he has to handle the ball better in the return game and not give up so much ground when he has it. Grade: Average.

De'Angelo Henderson, RB, sixth round: Henderson showed big-play pop in the preseason, but he finds himself at the most crowded position on the depth chart, behind C.J. Anderson, Jamaal Charles and Devontae Booker. He has just one carry this season -- on a failed fake punt attempt -- and has been inactive five times. Grade: Incomplete.

Chad Kelly, QB, seventh round: Kelly, who had a knee injury during his senior season at Mississippi and then a thumb injury during his pre-draft workouts, had been on the non-football injury list and like Butt, was moved to injured reserve for the remainder of the season. Grade: Incomplete.