He's definitely better than Andricoupoulos right now.
He is'nt very big so it may scare some scouts. If he continue to play like that he could be a 3rd rounder IMO.
He's not the biggest dman for sure but at 6'1" 186 he could definitly be a 6'2" 210 in two years, and the way he play with the puck always making good decison is an asset, plus I see him give some really good body chek.
I'll have to see Paquet and Bourdon to compare but if Andricopoulos is pick in the second round Vlasic is clearly a second rounder too.