It would all depend on the class, distance and weight of the next race if a last start winner's finishing position meant anything.

The fact that a runner won it's last race or it's last 3 or 4, is surely meaningless, unless it is again competing in a similar race to it's last start [and it's weight will go up and it's price down if it is]. The new price may or may not make a last start winner a good bet, regardless of it's finishing position. A win is a win is a win regardless of price, is a well travelled road to long term loss.