Not a popular opinion I know, but Rose was easily in my opinion one of the best players in the 2008 Currie Cup, the reason why he was taken on tour.
However he Sharks f**ked him over really bad in one of the last rounds or so, and was half the player going into the play-off stages that he was before the game.
Just fell apart after that, having no decent coach around meant there was no recovery possible.
Louis Ludik was on course for higher honours, but injuries and... restricted gameplans have adversely affected his career, still time, but I doubt he will get anything more than the odd Bok cap at most.
Jean de Villiers? Probably reached his potential but couldn't sustain it for very long. His sabbatical up north somehow robbed him of the knowledge that he can pass.
Hmmm, Keegan Daniel? Lot of SupeRugby experience but isn't showing any of it so far. Cock.
As for Scottish players? Never given the opportunity to show their potential so the point is moot.