There is a lot in this post!
Regarding colour, pet shop hamsters don't always conform to the standard so he could be a "bad" mink or dove. Either way, it doesn't matter as you aren't trying to show him, he's lovely all the same
As for taming, don't compare your hamsters, like humans, they all have their own personalities. Some adore humans, others just see us an annoying presence that provides food lol Just go at his pace and go with the flow so to speak
What happened with the cat?!?