I don't know why you think the 4th line has to be full of grinders, but I don't think any of our new signings are going to be part of a checking line. That'll be whatever line Faksa centers, or maybe they'll match power for power with the Hintz or Seguin lines.
Just an FYI, this guy didn't PK at all for Washington last year
(ok fine, 5 minutes and 33 seconds), and barely did for Philly (~1 min per game). Went a year back and it looks like he was a bigger part of the PK in Philadelphia the year prior, they were pretty good, 11th in the league. Kind of inconclusive, but he was the 4th highest TOI PKer among forwards in Philly 2 years ago when he last did it full time.