I guess I just find it hard to believe that T-Mobile either got a way earlier release date than the other carriers, which wouldn't make much business sense for Samsung, or that T-Mobile blows off a contractual release date with each phone. There's got to be more to it than that (maybe T-Mobile loads less onto their phones or does network testing much faster, etc.), but you are definitely right in that we'll never know unless we get a Verizon rep to share the inside scoop with us!
Regardless of the reason, I'm just happy to have had my S7 edge for nearly a week now! It's definitely an extraordinary phone!