Is it big enough?

Too small, too high, at least they got the knot right.

If you are perplexed, you are correct.

Whatever they thought the knot and carabiner accomplished, it doesn't. 

If they live until Spring, maybe they will learn better.

That's 6 MM cord and a quickdraw. The bottom carabiner has a wire gate.

They tied loops in the ends together.

Cross appeared recently.

This is where Geoff was murdered four years ago last week, no idea who put it up.