My 2 cents worth: Blais' Sioux teams used a lot of dump and chase with a VERY aggressive forecheck. It was the norm to send all 3 forwards in on the forecheck. It was common to see two forwards below the goal line, and not unheard of to see all three! Conversely, Blais' defensemen tended to be stay-at-home types with maybe one offensively oriented d-man on a team (ie. Murphy, Williamson, Roche).
Hakstol, like almost all current college coaches, tends to be more conservative on the forecheck. Now days, the Sioux might only send one or two forwards in on the forecheck, depending on the situation and the opponent. There is much more emphasis on the forwards' defensive responsibilities and yes, the Sioux sometimes play something like a left wing lock or a neutral zone trap. Interestingly, Hakstol's defensemen have included more risk-taking, offensively-oriented types epitomized by Chay Genoway.
College hockey has changed for many reasons: better coaching, better conditioning, bigger players, bigger goaltending equipment, etc, etc. It is not a simple thing to turn the clock back. That said, the hockey of the Gasparini and Blais eras was much more wide open and often more fun to watch. No slight to current players or coaches intended.