IRL - (Partial) Cover on Championship

Those who raed my column regularly will know I backed Sam Hornish at 9/2 (10pts) at the start of the seaosn (March 2006). He has been as short as 1-8 at one point in the season (followed by a DNF!).

The betting on the IRL championship now with one race to go is:

Hornish, Sam 8/13
Castroneves, Helio 5/4
Wheldon, Dan 16/1
Dixon, Scott 28/1

As a cover, I've now had 4 pts on Wheldon and 2pts on Dixon. What I'm *hoping* is to be able to back Castroneves at 16/1 at some point during the race (when I will then have full cover).... the worst case scenario will be a Castroneves win from start to finish... I'll then have lost a further 6pts by attempting to cover!