Ray,
That is where his reason was known. You only know that the doctor and rav are ehrlich and talmedei chachomim. You indeed do not need more in order to judge them favorably. However, you do need to know more in order to extrapolate to another situation. You should have asked them in a respectful manner. If they are truly ehrlich and talmedei chachomim they would have been happy to tell you. Not asking is intellectual laziness and kula shopping.