Urine on scat vs urine on backing/feature located opposite or 90deg to scat location. And maybe no visual at all and just a squirt on the dirt.
But I also know you like to put scent on something you can relocate to get them where you want them to be

You said more foot movement and having multiple focal points will certainly get them stepping around to investigate

At least that is my best guess until I get another clue

I love this thread. This is like getting a sneak peak at Doctorate curriculum in catching Wiley when your still a freshman. Interesting stuff. Thank You T for sharing.