The Pats currently have $13.1M in cap space. They will have 6 draft picks after the comp picks are settled.
Quinn would hit the Patriots cap for about $11M this year and nearly $13M in 2019.
In 2013 & 2014, Quinn was a one-man terror campaign as a DE, amassing 103 total tackles (a lot for a DE), 29.5 sacks, 7 PD and 12 FF, with 2 FR - one returned for a TD - over the course of 32 games under DCs Tim Walton, and then Gregg Williams (through 2016) in a 4-3 defense. He averaged about 75% of the D-snaps. Those teams both finished in the middle of the league in terms of both points and yards allowed.
Prior to 2015, Quinn had missed only one game in his four-year career, and that in his rookie season.
In 2015, Quinn missed 8 games, first with a knee injury, and then with a back injury that sent him to IR.
In 2016, Quinn missed 7 games, first with a shoulder injury, and then with a concussion that ultimately sent him to IR.
In 2017, played in 15 games/14 starts. He had 33 total tackles, 8.5 sacks, 0 PD and 2 FF, playing 59% of the D-snaps as an "LB" in new DC Wade Phillips' 3-4.
Quinn turns 28 in May.