None of those players lack size. Pysyk isn't overly physical, but he certainly will go into the corners and do what needs to be done. Brennan can be a very physical player, though I question his upside as an NHL player given his poor decision-making in his own end. Don't feel I've seen enough of JGL or McCabe to comment on the type of game they play.
In any case, I still feel the organization's biggest need, and what should be our focus in this draft, is for more quality/skilled forwards, particularly wingers (now that we've got Ennis, Hodgson, Grigorenko, Girgensons, and Catenacci as (potential) options down the middle). If we need a physical 2nd or 3rd pairing d-man, it shouldn't be too hard to pick one up as an FA or in a trade.