I do a lot of hiking & backpacking and I've seen these bent trees quite often. From saplings to 100-yr olds and everything in between. What this tells me is that bent trees are continuously being formed and by nature, not human manipulation. Most likely ice storms.
The Internet is full of articles on them being Indian trail markers but I have serious doubts about this. First, how would you distinguish a naturally bent tree from an intentionally bent tree? That alone makes it a poor choice for a marker. Next, a bent tree takes many many years to grow big enough to be a useful marker, making it a pretty useless marker in the present. Third, Indians probably didn't need markers, they knew the land exceptionally well.
You've assigned significance to the bent tree because it happens to lie on a line that crosses some other odd-looking elements. And you've assigned significance to that line because of those odd-looking elements. Most likely there is no significance to any of it, they are just odd-looking elements. Most likely the heart rock and bird rock are natural, just from the 2 photos I don't see anything that suggests manipulation. Also, I've seen a ton of odd-looking rocks on my hikes, they are pretty common. In the first photo it's hard to tell because it's zoomed in pretty tight.
I consider the Black Book to be obvious fiction, and it seems to be a major originating source of subsequent KGC lore. Absolutely none of whic Even if the h has any backing evidence, nor any resulting recovered treasure. Yes, I know, no one would ever publicize finding a KGC treasure, but if it actually happened I bet you would hear about it.