Almost lost among the constant conversation surrounding what defensive end Jadeveon Clowney did and didn't do at the NFL Scouting Combine Monday, were notable performances by several other defenders, including three with intriguing backgrounds -- outside linebackers Anthony Barr and Kahlil Mack and defensive tackle Aaron Donald.

1. Outside linebackers in a rush

Barr, an athletic pass rusher from UCLA whose many highlight plays included the blindside sack that sidelined USC's Matt Barkley, was timed on TV in 4.66 and 4.63 in 40 yards and had only 15 reps of 225 pounds in the bench press. Those are pedestrian numbers for a player NFLDraftScout.com has rated in the top ten, but they may not have a big negative effect on his draft because his athleticism and upside are a key factor.

Mack's 40-yard time was also announced at 4.66, but he showed his explosiveness with a 40-inch vertical. And, like Barr, who led the Pac-12 with 13.5 sacks last season, is considered to have great value in terms of upside.

NFLDraftScout.com has a verified 40-yard time on Barr from last spring at just below 4.50 and he had a much faster three-cone -- 6.82 seconds -- than Mack's 7.08. That is not entirely surprising or unexpected given his offensive background.

Barr was an offensive player until his last two years and is still learning his way around the other side of the line of scrimmage. Mack, who played only one year of high school football before becoming a big fish in Buffalo's small pond looks as good on game tape as he did on the 2013 stats sheets -- 19.0 tackles for loss, 10.5 sacks, five forced fumbles, three interceptions.

Because Barr is newer to defense, some scouts believe he has the higher "ceiling."

2. Pitt's decorated DT Donald turns in more elite numbers

Donald, thought to be undersized at 6-0, 285 at Pittsburgh, played big last season and is getting bigger in the post-season.

His explosive power was obvious in games, were be blew up the line of scrimmage and led the nation with average sacks per game (1.6) and tackles for loss (2.4). On Monday, he showed why. He blasted through 40 yards in 4.86, had a 32-inch vertical and benched 225 pounds 35 times.

This should validate that this mighty mite of an interior lineman could move up in the first round of the draft.

3. Clowney questions, bro?

Clowney, the No. 1 rated player in the draft, did enough to show why, with a 40-yard time that was announced in 4.53 second, a vertical jump of 37.5 inches, 21 reps on bench and a 10-03 broad jump.

He had promised a 40 time in the 4.4 range, but at 4.53 is among the best ever for defensive ends at the combine. Four other defensive ends have run as fast or faster this century at the combine on NFLDraftScout.com's list.

The best time this century for a defensive end at the combine came in 2002 when UAB's Bryan Thomas, at 6-4, 266, was clocked in 4.47 and was the 22nd overall pick (New York Jets).

Clowney's 10-yard split was 1.56 seconds.

Three others had a 4.53 -- Lawrence Sidbury Jr. (6-3, 226, Richmond, fourth round, 125th overall to Atlanta); and two in 2013 -- Margus Hunt (6-8, 277, SMU, second round, 53rd overall to Cincinnati), and Cornelius Washington (6-4, 265, Georgia, sixth round, 188th overall, Chicago).

Clowney said he wanted to best Jevon Kearse's mark of 4.42, but Kearse actually ran a 4.58 and was listed as an outside linebacker when he came out of Florida in 1999. The last defensive end picked No. 1 overall in the draft was North Carolina State's Mario Williams in 2006 who, at 6-7, 299, ran 4.70

After his impressive, albeit limited performance, Clowney pretty much stayed out of the position drills, which left him open to criticism by the talkative crew at NFL Network -- at least unit he sat among them on stage -- as well as other players.

4. Auburn's Dee Ford backed up by docs, doesn't back down

Auburn defensive lineman Dee Ford was unable to work out because, reportedly, he had back problems. But his mouth worked fine.

"I'm better (Than Clowney)," he claimed "Let's put it like this. People like to talk about sized all the time. Size is pretty much overrated in my eyes. People are just looking at the fact that he's a physical speciman.Honestly, if you want to watch the film, he plays like a blind dog in a meat market, basically."

When given a chance to back off, he kept his mouth doing what his feet couldn't -- running.

"When I rely on my athleticism rather than bring the technical aspects, the fundamental part, watch film to become a great pass rusher, I become a blind dog in a meat market," Ford said. "When I watch Jadeveon that's what I see. He's 6-foot-6, 240 and he just plays. But at the end of the day, does that make you a great pass rusher or a better pass rusher than me? No.

"We're not saying that dog can't run. We're just saying he can't find the meat. That wasn't a personal shot at him at all. It's just fun, it's competition."