Want to know why guys like Pirri can't make the NHL full time, despite scoring in small sample sizes in the NHL and lighting up the AHL? Because teams don't want players who only bring scoring, unless they're elite at scoring. If Sprong doesn't become an elite scorer or can't round out his game, he won't make it to the NHL full time. Being a watered down version of Sykora (which is an insult to Sykora, but w/e) isn't a good thing for Sprong.
One trick ponies don't make the NHL anymore. If Sprong is useless without an elite playmaker setting him up, he'll be in Europe in 3 years.