There were no large numbers of people in the deal. It is a small sport with a small number of people. There are no "actuarial tables" that give probabilities for winning five, six, seven Tours. There are no laws of large numbers of people for a sport that has at most a dozen riders who can realistically win the Tour in any given year and SCA is betting on a single rider. There are not hundreds or thousands of SCA bets that would see the results revert to a mean. The only thing SCA had to go on was the history of the sport, the chance of crashing out, the chance of being injured, the chance of peaking incorrectly, the chance of any number of other factors that might prevent a rider from winning, most of which are sporting related. Research into those factors would have inevitably revealed the history of doping in cycling. It is likely that people at SCA discussed it. Discovery has a way of turning up interesting information.
Maybe you want to believe the SCA folks when they play stupid, but I don't see how you can reconcile the self promotion of Bob as a master strategist and expert bridge player while he also claims to be too incompetent to do the trivial bit of investigation that would have revealed endemic doping in cycling that goes back a hundred years. Is it so hard to believe these guys went into the deal with their eyes open?