Usually there are just one or two things prospects struggle with defensively: maybe they're not quick enough to backcheck (check for Vilardi), or they don't anticipate well (check), slow to disrupt passing lanes (check), too slow to reset against the rush (check), struggles with lateral movement (check), or can force turnovers (I'll give you that one)...and Vilardi seems to struggle with them all.
Obviously you don't draft Vilardi for his defense. But for a team like Dallas that needs talented two way forwards (Seguin, Benn, and Spezza are hardly the pinnacle of two way play), I'm just not a big fan of the fit for the Stars.