I don’t disagree with anything you’ve posted. But, the question remains, are, for example, Michael and Gabriel sinless? If no, what evidence do you have? If yes, my original post holds - sinless is not a trait exclusive to God. Also, I’m not saying that Angels are unable to sin, just that they were created without sin.
The fallen angels have sinned, the angels that did not rebel have not sinned - yet. They could but they won't.