did you trace back every single horse though? That's a lot of branches of the family tree to go through since impressive was so far back ;) if you did and you could confirm that in those many generations that made the sire what he is that not one horse had any link to impressive anywhere then yes you are correct...but that would take awhile to do ;)
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Actually not that hard. All you have to do is go back to the date/year Impressive was foaled (1969). Anything foaled before that can not have him in their pedigree. Is not hard and does not take long to look at all 4 lines in a horses pedigree.