Not sure if there is an advanced metric that indicates this but I imagine skating and size helps a lot. I've used this word a lot in the past when discussing Murphy, but I always thought he was very rangy. Not the best skater but he was able to close off space and had a great stick. Used his reach from good positions to disrupt the puck carrier or break plays. Seth Jones has this plus top tier skating.
The UFA list is a little bleak for players that have these qualities, much more traditional larger guys who are better at breaking cycles. That being said Oleksiak, McCabe and Gustafsson would be solid pickups. Ryan Murray is another interesting name, I didn't follow him in NJ but I feel like he is evolving his play style to be more of a shifty shutdown player (I may be way off here). Poolman and Hakanpaa both are near the top of my list. Merrill and Hutton feel like guys to look at if we miss out on some of the other names listed.
