I'll disagree there. I think it all comes down to defining the word "physical."
To some, "ohysical" means gritty, in your face, instigator who plays chippy. Someone like Prpich or Smaby.
To others, "physical" means grinding it out, putting yourself in front of the net (taking abuse), and playing the body in the corners or crashing the net. In this mindset, I see Zajac as very much this type.
Zajac isn't a pure finesse player like Spirko. He's not a gloves to your mask type player either like Prpich. I think he's right in the middle.