Winning the white jersey means being at least in the top 15 or thereabouts. If you ignore Andy, you get Nibali (7th) in 2009 and Gesink (5th/6th) in 2010 (no reason to ignore him in 2008). If you ignore Contador, you get Soler (11th) in 2007.
Who among the starting youngsters has the level to be there? Who do you see in the top 10-15? Kruijswijk is possible. Taaramae, at his best, would be even better, but as you guys say it's not likely that he'll be even close to his best. Anyone else would have to take a big step forward to win (which is not that unlikely - would Pinot being near the top 10 be an actual surprise, if he were to ride?)