I know what they ask for but we have an academy member explaining the real motives of the choice. I guess they want only consolidated winners to avoid devaluing the award even if the members should (in theory) only judge 2013 performances.
The Laureus World Sports Award nominees are among the most remarkable men and women from the world of sport along with the greatest sporting achievements fans have marvelled at throughout the year.
That means great sportsman + great sporting achievements throughout the year. You have to have had an outstanding performance in the year that you are nominated (with few exceptions which are discussed on the website if you are interested). If you have a body of work previous to that year, that is also celebrated. The "nomination" is how that is celebrated - so all of those nominated were outstanding on the year.
Winners are often outstanding over a period of time as well as in the year nominated. That is what mark's an outstanding sportsman - generally - they have a continuous body of high level outstanding work. Usain Bolt, Rafa Nadal, Cristiano Ronaldo, Sebastian Vettel, Missy Franklin, Serena Williams, etc., all have an outstanding body of work behind them and were outstanding on the year nominated. They can't all win - but each is deserving.
I am unsure why anyone on this BB would wish to do else but celebrate and praise Sebastian for his brilliant body of work and 2013 season - which was to put it mildly - incredible. His achievements went beyond numbers (i.e., nine race wins in a row, thirteen on the year) - the Laureus does not celebrate numbers except as a by product of the extremely hard work the athletes put in, including Sebastian. His preparation and continued dedication and effort are what lessened the cockpit incidents, ensured a fit driver in body and mind and prevented costly errors. It all looks so easy - but as Rosberg pointed out last race, there is a hell of a lot going on in the cockpit maintaining that 20 sec lead. And to do it consistently through changing tracks, tyres, set ups and other factors, is remarkable.
That is what the Laureus is celebrating in this case. Race fans should be 100% behind that in support of a major award recognizing the champions of a sport we love. Some sports are not celebrated by Laureus at all.