So... they found "holes"...

ala "The new find, dubbed "Bluestonehenge" after the color of the 25 Welsh stones of which it was once composed,..."

So, if they found "holes" how do they know the Welsh put them there? How do they know the stones that were in the holes were blue? and Welsh? And, where are the stones now?

I have heard of the legend of Blue Balls and I don't believe that either.

What am I missing here? Is there sommat I don't know about the Welsh?

BTW, recently, I discovered that my family may be originally Welsh. Would that explain my blue, ahhh, demeanour?