I understand what you mean, and I agree. There's that bit in the middle which is either or. But you are wasting your time trying to explain to people who simply don't want to know.
The fact that you agree given you're of the same persuasion as Dave is hardly a revelation moment of Redwood proportions. You have however (unlike Dave) admitted a "bit in the middle". Progress at last.
Now you people can try and paint the people involved in this discussion in the childish "goodies and baddies" fashion that so characterises the thought processes of the more rabid McCann supporter but the fact remains Dave made a statement that SY had discounted the dogs findings which to anyone with a modicum of reasonableness could see is patently not true.
The fact that SY stated only last week that Madeleine may have died in 5a means they either believe the dogs findings or are keeping their options open and suggesting they are inconclusive.
Unless SY come and specifically trash Grime and his dogs or unequivocally state Maddie left the apartment alive then it is a fallacy to state with certainty that the Yard have discounted their findings.