*In advance of the 2015 season, former NFL scout Daniel Jeremiah draws on his evaluation experience in "Trait Eight" -- a series that identifies three key characteristics for eight high-profile players at various positions. Today's file covers pa s rushers. Below, you'll find DJ's a se sments of six of the most disruptive forces in the NFL -- plus two rookies who are already making waves in their first preseason. *For more analysis on this topic, J.J. Watt, DE, Houston TexansThree traits: Quick feet, quick hands, relentle s. The first thing that people think of with is the strength, but when you study his game, it's clear he wins more off quickne s. There are a lot of pa s rushers with quick feet, and there are a lot of pa s rushers with quick hands, but Watt has the best combination of both.Expectations for 2015: I don't see him slowing down. OK, the 20-sack mark is a pretty high bar to set, but I think he's going to be north of 15 or 16 sacks again. My forecast, quite simply, is that he's the best defensive player in football once again.Von Miller, OLB, Denver BroncosThree traits: Bendy, long, instinctive. When he was coming out of college, scouts latched onto the term "Gumby" -- his ability to bend and wrap and contort his body, while maintaining perfect balance, is just so unique and special. You talk about guys who can bend the edge to get to the quarterback, so they don't run by the quarterback -- get by the tackle and flatten -- Miller does it better than anybody.Expectations for 2015: Hopefully, we see a fully healthy this season, and if so, he's going to be right in the mix for Defensive Player of the Year.Justin Houston, OLB, Kansas City ChiefsThree traits: Explosive, strong hands, finisher. It's hard to imagine posting 22 sacks and flying under the radar, but unfortunately, Houston spent last year in 's shadow. One of the most important aspects for a pa s rusher is to be able to finish -- not just beat your man, but actually get the quarterback on the ground. Houston is an outstanding finisher.Expectations for 2015: Houston -- and rightfully so -- but I don't see him taking the foot off the pedal at all. 's health is a concern because he does such a good job of eliminating the escape room for a quarterback. If Poe's not in there collapsing the pocket, Houston's production could be affected. That said, this guy should still be a force to be reckoned with.Robert Quinn, DE, St. Louis RamsThree traits: Fluid, agile, leverage. Sometimes you sacrifice run- Trey Burke Jersey stopping ability as a defense when you have an edge rusher with athleticism and length -- offensive linemen might be able to move around a guy who's a little bit narrow -- but Quinn is really, really good at playing with leverage and power.Expectations for 2015: I don't think we've Dwight Powell Jersey seen the best of , which is a frightening notion for opposing offenses. He started off very slow last year; I don't see that happening again in 2015. The ' D-line is terrifying. Good luck blocking Quinn and -- that's a pick-your-poison conundrum.Mario Williams, DE, Buffalo BillsThree traits: Size, versatile, power. After Houston surprised everyone and took Williams over with the first overall pick of the 2006 , : "He's almost 6-7 and runs a 4.7. His vertical jump is exactly the same as and he's 90 pounds heavier." Charley nailed that pick. Williams is just an absolute freak of an athlete.Expectations for 2015: The ' D-line gets a lot of attention, but I think Buffalo has the most talented defensive front in the NFL. The ' starting quartet racked up 40 sacks last season, and Williams led the way with 14.5. With new head coach Rex Ryan's ability to get his top players in favorable matchups, I think we could see Williams' total go up even more.Cameron Wake, DE, Miami DolphinsThree traits: Twitched-up, effort, rolls his hips. Rolling his hips is exactly like it sounds. When you've got a guy who's really, really stiff, it's kind of a steady power rush. Wake's able to roll his hips on contact just creates a jarring shot on offensive tackles. It's not a steady pushback, it is an explosive jolt that he provides.Expectations for 2015: The ' defensive line is going to test the anchor of every O-line Miami faces. With Wake lining up next to , that is a whole lot of power, strength and explosivene s coming at you. Wake's immense talent is no secret in NFL circles, but he really hasn't received the widespread attention he deserves. This could be the year he achieves ma s notoriety among football fans.Shane Ray, OLB, Denver BroncosThree traits: Intense, high motor, tight. Ray's the opposite of a long, fluid pa s rusher; he's more of a compact, stiff force. Ray reminds me a little bit of because he's really good with his hands, he's strong and he just never quits.Expectations for 2015: It's challenging to get in the pa s-rushing mix when you have and in the starting lineup, but Ray should be able to make an impact in sub-packages and could record six-to-eight sacks this season.Randy Gregory, DE, Dallas CowboysThree traits: Loose, lean, natural. He has a slight build -- much was made of his weight (235 pounds) at the NFL -- but he's very similar to Jason Taylor; they're both narrow, long, very loose athletes.Expectations for 2015: With , Gregory will have an opportunity to play right away. If he stays focused, Gregory's capable of being a double-digit-sack guy in Year 1.Follow Daniel Jeremiah on Twitter .