You know that a spot on test would have been to put your ECU in someone's else's bike after your ECU started exhibiting symptoms. This is not to say that your way won't tell you something. But a perfectly running bike that gets only a different ECU and then won't run will tell you it is indeed the ECU. Putting a cold ECU in your bike tells you that a cold ECU works in your bike. You rule out any and all extraneous factors with the first method.
A fine point? Perhaps even moot.
