I mean, Staal was a borderline 1st pair D at one point, but for the past few years he's settled into the 2nd pair role. This does have an impact on him as a player. He can handle Crosby, Giroux and Ovechkin still, it just helps to also have a first pair LD ahead of him to also share the load of the tough assignments.
It's not coincidence that Staal has been Jekyll and Hyde while McDonagh has been out. I'm confident once we get McD back our defense will return to being dominant.
Also, as much as I loved Stralman and wish the Rangers kept him, at this point it's not even worth complaining about because Dan Boyle has been excellent. Dynamic offensively and solid in his own end. I also think the return of McDonagh will help Boyle too. He can slide in next to Staal and play the rover as he does so well. Very happy with Boyle so far.