Regarding being territorial:
At least he was never hissing, biting or anything like that.
From how I observed him, he was very shy in the beginning and a "if in doubt, rather not" personality. Also not being "bribed" with food, so it was not possible to tame him with food but rather the other way, he had to become tame to dare to take food during hand-feeding, looks for me very much like "shy, rather not".
They dont foot stomp or
black beard.
Indeed, mine never did so far. Also no pretending to mate.
He for sure is male: I saw the sperm plugs.
Adult animals prefer not to poop where they sleep; hence Kai and Taco dont poop in spots they use, esp not sleep spots
Indeed, this is his behavior. The spot where he poops, it's the most "boring" and "useless" in his enclosure, so to say: Not good for basking, sleeping, climbing, eating.
The veggie eating in private Kai does and Taco did could also be a wish not to eat what is yours until you leave them and walk away, just in case those veggies might also be yours
Possibly. With not taking insects from my hand for months, I'm sure very much. After he dared to take the first one (a mealworm), and there was obviously no angry reaction by me

but more mealworms offered, he then almost always took some. With "almost" I mean: Sometimes he just isn't not hungry, and he isn't somebody who wolfs down everything. But not daring taking it, I never saw this after.
With bugs that predatory instinct takes over and they just cant help themselves lol. Just me musing...
For Taco, this was clearly not the case. He didn't dare taking them.
But also generally, Taco can easily leave some insects in his bowl. He does not necessarily empty it.