FRISCO, Texas — Robert Quinn said he had mixed emotions.He was excited to watch the Cowboys “offense moving the ball ridiculous,” Quinn said, “and the defense playing great” against the Giants in Week 1 and Redskins in Week 2. But the defensive end also found it “frustrating” he couldn’t suit up with his teammates as he served a two-game suspension for violation of the league’s PED policy.“It’s a little weird sitting at home watching it versus being on the sideline or actually in the middle of the action,” Quinn said Wednesday from his locker after practice. “All I could do is just sit back and keep my blood pressure down, I guess.”The league announced Quinn’s suspension on August 8, two days after he underwent surgery for a broken hand in training camp. Quinn’s agent, Sean Kiernan, issued a statement after the punishment was announced blasting the league for being “tone deaf.” He said Quinn has a history with seizures that requires him to take preventative medication. The alleged violation, Kiernan said, was for a masking agent that Quinn had never heard of, at such a low level that an expert said it should be considered a false positive.“I am extremely disappointed in the NFL for following through with this suspension,” Kiernan wrote. “The level of probenecid in Rob’s system was equivalent to one kernel of rice in a bag among thousands.”Quinn rejoined the team through training camp after hand surgery but couldn’t participate in team activities or work out at the facility the first two weeks of the season. So he worked out at an EXOS training facility near the Star, arriving around 7 a.m. in the morning and working out until 11 a.m. or noon. Afternoons were slower.“I didn’t have much to do after,” Quinn said.Now, Quinn returns to a Cowboys team that opened as 20.5-point favorites against the Dolphins, who traded the two-time Pro Bowl selection to Dallas in March. Quinn isn’t putting extra hype on the matchup with his former team.“Don’t try to make things more than what it is,” Quinn said. “I don’t want to overwork myself, overhype myself. It’s a football team. As a team we want to do one thing and that’s win.”NFL:Which 0-2 teams should hit panic button and who’s still alive?POWER RANKINGS:Cowboys, Packers join Patriots in top five after Week 2But Quinn has seen the rebuild, he said. He doesn’t agree with some of the criticism leveled against a Dolphins team that was shut out 43-0 in Week 2 to the Patriots. The Ravens toppled Miami 59-10 the first week. Miami traded defensive back Minkah Fitzpatrick to the Steelers this week.“A lot of the guys are gone,” Quinn said, laughing. “It’s kind of crazy what’s going on. I kind of broke it down like this way: I think Coach [Brian] Flores is doing his thing, same thing [Raiders coach Jon] Gruden’s doing. He’s putting his team together. However you want go about it, that’s how he’s going about it. He’s got I don’t know how many first-round draft picks already. It’s probably not great. I’m not in the building so who cares. Again, he’s the head coach. He can do what he wants.“At the end of the day, like I said, you’ve seen one coach do it. Don’t knock another coach for doing the same thing.”Quinn was a full participant in Cowboys practice on Wednesday, working alongside defensive linemen on his burst, pass-rush moves and conditioning in the portion of practice open to reporters. He wore gloves on both hands but no clear protection for the one he fractured. Head coach Jason Garrett said Quinn is “still dealing” with the injury, but Quinn hopes not to wear a cast or other protective material in games.With DeMarcus Lawrence starting at left end, Quinn is a viable candidate to start on the right. Cowboys defensive lineman Tyrone Crawford (hip) could miss the game as he recovers. Dallas released defensive end Taco Charlton, its 2017 first-round pick, on Wednesday to make room for Quinn on the roster.Quinn has recorded 69 sacks in eight career seasons, including three double-digit campaigns. Last year, he notched 38 tackles and 6 1/2 sacks for the Dolphins.Quinn paused when asked if he could play 55 or 60 snaps in his first game back.“If you ask a man what he can and cannot do, I’m sure he’s going to tell you he can do everything,” Quinn said. “If they need me to play 50, 60 snaps, that’s what I have to do.”Follow Jori Epstein on Twitter @JoriEpstein.