The other anchors were bowlines, he had the rope but didn't know how to tie the knot with a bight. Two problems with using carabiners, a single carabiner is a point of failure and, yes, people steal carabiners from anchors. It is more common at Great Falls but not unheard of at Carderock.
Sunday, January 17, 2021
The nice fat rope is a good anchor, the tiny cord with single wire gate carabiners, not so much. He's using a cam and a nut, prone to ripping right out in the rock. Somebody asked if that was a myth. We live in a city of stone buildings, not one made from this rock, it is never used where it would be weight bearing.