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T206Collector...ask him how to improve a 3 to a 5? Because I'd wager there is no way to do that in an undetectable fashion. And remember, card soaking is not about improving a 6 to an 8 -- it is about cleaning off a back to move from a 1 to an 8. And it is just as easy to move from a 1 to an 8 as it is to move from a 1 to a 5. I just don't have any concern about that particular movement.
I suspect you'll find a lot of dealers of PSA 8 material to back his theory up though.