Dyffryn Ardudwy

Could the smallest of the 2 dolmens be a mistake?
From the pictures I’ve seen it impressed me of the size, if all the stones that covered it have been removed, it must once have been quite impressive an object to look at and be near.
I wonder if the children at the nearby primary school have any clue what exactly lies to the rear, and if so do they apreciate its importance as the people who built it did and do they play there?