If you look very close in the last picture, its definitely stress stripes. The most pronounced one is dark from the eye back across the gill, with a lighter area above and below, all running horizontally.
Then on the body its a much lighter line running horizontally down the body, from the gill to the tail. There is a second light line running horizontally along the bottom of the body.
The other reason I believe it's stress, is looking closely at the last picture, you can see the scales in a little bit of a reverse pine coning effect. (Not dropsy type) But it will cast a bit of a shadow under those, making them appear darker beneath them.
A couple of my females do that every time I change the water. They are not breeding stripes since they go away in about a half hour after the water change.
I would suspect that once he is in a better environment his body will be darker than what the current pictures show, and I wouldn't be surprised if the fins lighten up.