That was me that said Justin might remind Quincey of a past abuser.
Could be the shirt he was wearing, the color or style of his hair...who knows.
I believe it is possible because My Brother's ex wife had a cat that her ex-husband hated and was not nice to. My brother had a heck of a time with that cat and my brother is huge animal lover. Well it turns out my ex sister in law had bought my brother the same cologne she used to buy her ex because she loved the smell
After my brother quit using the cologne, him and the cat are best buddies now(my brother got custody of the cat)
But it sounds like things are getting on track, why don't you try to sign Quincey up for training classes and have Justin go along to?
It would be good socialization for Quincey and teach Justin some basic training tools.