That's just poor scouting. And then there's the relatively few top kids that they locked up early (LeLeggia, Stultze and Commesso, etc.) and lost due to negligent management or in one case because of the NHL draft. UNH would have been better off simply waiting until 6-12 months before enrollment and recruiting older kids that at least were men with more experience.
It causes me to recall Souza's opening press conference when he became head coach where he was asked about his recruiting philosophy and said "there's a lot of good hockey players out there". That was my first "oh, no" moment with him. Jack Parker and Jerry York must have rolled their eyes when they were apprised of that comment.
In light of the fact that UNH is second rate now, the next coach would be wise to skip trying to recruit 16 year olds (the transfer portal makes it less enticing) and simply shop on the transfer portal and the 21 year old freshman crowd. That's Lowell's approach. If the coach is talented, he likely could use their maturity and hockey experience to at least put a reasonably good team on the ice.