Can produce offensively, but even that is slipping from him.
FYI to those that doesn't know what these things mean:
BPM: Impact on boxscore stats. Offensive (OBPM) side impacts player WAR but defensive side (DBPM) doesn't seem to matter.
XPM: Impact on expected goal differentials (Corsi but adjusted for shot quality factors and usage factors at play-by-play level). OXPM accounts for just over 50% of OWAR and DXPM 100% of DWAR.
PPBPM: BPM but on the power play.
Not shown: WAR: wins over replacement (estimated overall on-ice impact). You can get an idea by combining OBPM, XPM, and PPBPM though.
Not shown: PKXPM because Stafford is basically 0 across the board.