Going back to what you said, your angle on this would have tremendous value if we were able to quantify something we're seeing that isn't typically quantified, compare it to that of other QBs at similar stages of development and experience, and find that Ryan Tannehill is exhibiting that kind of play much more consistently with future franchise QBs than with future failures.While I agree with all of this, and recognize you added the caveat of winning, your original statement, simply asked, "Then why isn't that reflected statistically, if the difference is so obvious to the naked eye?", so that is what I was addressing, being able to see the difference.
What we're left with in the absence of that is a global objective measure (QB rating), on which Ryan Tannehill is indistinguishable from Chad Henne at similar points in their careers, despite the fact that many of us thought we "saw" something "franchise" in Chad Henne at the same point in his career.