Looks fantastic deepsouth!
There is a difference between the walmart meat and regular grocer meat. Practically all of the primal cuts are injected with an 8-14% solution. In essence they do the brining for you. It shows in the end product but not necessarily a negative effect on taste or texture.
However, this pisses me off! That's 8-14% added to the weight and we are paying for that. I don't always brine my butts or shoulders. Subsequently, I buy my un-solutioned choice briskets at walmart but that's about it.