Let's avoid jumping to conclusions about the necessary uniformity of an event. The idea that the healing of a servant's ear standardizes Pilate's order for Jesus' flogging seems too assertive, as if this event was a sine qua non condition.
Historically, Pilate's decision to flog Jesus could have been motivated by external political factors such as public pressure or the desire to avoid trouble, even if the ear incident had not occurred.
The relationship is more conditional than decisive, which weakens its direct impact.
For example, if Jesus had healed no one, Pilate might have ordered the flogging to ease tensions, a fail-safe against disorder.