I posited this in a thread that I can't quite remember the name of awhile ago to do with Sprong's defensive deficiencies, and possible correlation to nationality. This may be another puzzle piece.
As a Canadian living 4 years in the Netherlands, I have found that by and by large, Dutch consider themselves experts in everything and won't admit weaknesses/nor work on them. They largely refuse to take responsibility for a situation partially or completely of their making and do not acknowledge others at large unless interacting with them. They also remain willfully ignorant of how their actions affect others.
As Sprong is Dutch, I genuinely think that this cultural psyche has hugely impacted his play style. I suspect we see a Sprong this year prone to excellent offensive output, decent defensive play slacking off into laziness; rinse and repeat for 10 game cycles. I hope I am wrong. But this is what I expect. The guy to bloom offensively to get a 2 or 3 year contract out of this season, but not to put the body on the line for the team... or the effort.
Hope I'm wrong.