That could be possible, or they smelt the scent as it lingered with human scent, but not the biggest reason. Its simple - I don't believe its possible to "cover up a scent". The human scent is still there, a deers noise is very sensitive to that scent, a few wafers, or coon piss IMO will not cover it up. Put a bottle of perfume on a stinky fish - and it smells like a stinky fish with perfume.

I do not use coverscents - and I have also had many deer feet from my tree. In fact the closer they come the less they seem to wind you - if you are in a tree. The danger zone IMO is that 25 to 50 yds or more down wind. It seems thats the range your scent settles to deer nose height the most.

And as far as having deer downwind and not getting busted - I have only one answer to this, and I don't care what you are using as cover or how much carbon you have wrapped around you.

Even though the wind was "blowing" towards the deer - your scent stream never made it to there nose. Even in a steady breeze, wind does crazy things in the woods - it swirls, dips, edies, rises, turns - etc.etc. I have had it happen too many times without the "products" to believe they really make any difference.

Can't fool a mature deers nose - I gave up trying years ago