I don't think they see too well before daylight in the thick of the woods. Imagine you're a turkey roosted up in a leafy oak tree and something comes walking under you. Heck it could be a deer, could be an armadillo, coon, coyote, or a number of other things. If you were look down and picture yourself walking, you aren't the size of a ball cap once you get where the bird can see you under the tree. And in the dark, especially down on the forest floor where it's darkest, you might not be seen at all. On the other hand, if you're walking out in the open towards the roosted birds, you might want to rethink your entry. I think you've got all the wisdom you need, it's just a matter of being there on the right day to make it happen. A lot of times it takes aggressive pursuit and some run and gun tactics....or "crawl" and gun.....to drive him crazy enough to come in. Sitting still doesn't always kill them, no matter how good you sound to him.............sounds like you got that part figured out too, judging by your story of the leafy suit in the briar patch. That's not fun by the way. Stick with it as long as you can doetrain, I know it gets tough in the late season when the frustration sets in. Good luck!