Holloway, and to a lesser extent Greig and Cuylle , all fit the patterns of guys who can potentially bring value to a middle/bottom six role. These are the guys who filled out teams like Detroit back in the 90s, or even New Jersey. More recently, you saw teams like Chicago and Pittsburgh have valuable role players supporting their stars.
Holloway, to me, could be to the forward group what Lindgren is to the defense. At least in terms of impact. I think he brings size, speed and the ability to keep the opposition off-balance.
If the offense comes together, he's potentially a guy who can slide up into a top six role to compliment skilled players. But if not, I would't rule out him having a somewhat similar career to Manny Malhotra if he ends up sticking at center. And if you can get 15 goals, 35-40 points, that's a solid contribution on top of the other things he does.