Yea exactly. This is him choosing no not use the toilet, and preferring the comfort of the diaper. So he is holding it. I should mention that he has gone poop in the toilet in the past, 2 times at his house, and 2 times here, so its not totally foreign to him.
I can always tell when he really needs to go because right after lunch and he has his diaper on, he literally WAITS by the bedroom door to go to bed (to poop). And will start to cry and whine "Can I go to bed now!?!?!" if I am still tidying and the other kids arent ready to go down yet.
Arggg its soo frustrating LOL!