Disclaimers discourage argumentative clash and take extra time to think of beforehand.
I like to think of possible holes in my arguments before I make them. Sometimes I discover minor holes that don't invalidate the whole argument but do reduce its force. (For example, the argument isn't universally valid but only if XYZ is true, and XYZ seems pretty likely to be true but we can't be sure yet.) Should I not point them out myself? Or are you thinking of some other kinds of disclaimers?
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This is incoherent. "Average is the same" and "total is the same" are logically equivalent for cases where n is the same, which I think are all we're concerned about here.
It could be either, so he's not justified in assuming that it's the average one in order to support his conclusion. He's extrapolating beyond the scope of their actual equivalence, that's the reason his argument is bringing anything new to the table at all.
He's using their mathematical overlap in certain cases as prove that in cases where they don't overlap the average should be used as superior to the total. That makes no sense at all, when thought of in this way. That is what I think the hole in his argument is.