The reality of rookie projections is that they are exactly that; projections. Unless an Anthony Davis or LeBron James walks into the league (which, there are very few Anthony Davis or LeBron James caliber of players who walk into this league) no one knows what sort of success a guy will have until we actually start seeing them play.
I'm perfectly fine holding my opinion off on Stauskas until a later date just as I did with Ben last season. Thankfully, we're in a position where we don't need Nik to contribute to win games. So keep giving him minutes and exposure to the NBA and hope we see dividends of that patience down the line.