I really think it's a combination of things. Having last year's team ranked #1 with several All-Americans and players with personality was big. Kids identify with players and the current team has some with Scanlan, Trimboli, Dordevic, Porter etc). Having Hiltz flip to Cuse from Denver helped. Sounds like Spallina dreamed of playing for Cuse so may have chosen Cuse no matter what, but having a highly ranked program with March etc may have put him over the top. Spallina clearly has been critical to getting others on side. Classic case of winning, new blood (March) and a potential star in Spallina creating a domino effect.
Recruiting has been tough in recent years when kids and parents have choices of Ivey schools, Duke etc and Cuse has "struggled" relative to past glory.