Trying to stay on task and true to the heart of the conversation:
We seem to agree that Wilson was in a good situation.
We seem to agree that Tannehill was in a worse situation.
We disagree on the disparity and how much each QB thrived within his situation.
Here is my over-arching point (again): Tannehill has done enough to lead me to believe he has a legitimate shot to become a franchise QB. Wilson has done enough to make me believe he is already a franchise QB. I think part of the disparity here stems from what you want out of the QB position and what I want from the QB position - what IS a franchise QB. To me, a franchise QB is efficient, timely, and talented enough to win a SB with a team talented enough to win the SB. There are only three QB's in the NFL who (more-or-less) guarantee a postseason appearance despite their surrounding group (Rodgers, Manning, Brady), and that's assuming they stay healthy. Every other QB in the NFL is situation-dependent - including guys like Big Ben, Drew Brees, Eli Manning, Joe Flacco, and the young guys like Kapernick and Wilson. Luck has taken two really bad Colts teams to the playoffs, and I get the sense that he'll be more like that first group (playoffs guaranteed). But these other QB's have enjoyed just as much - if not more - playoff success as that group of 3. Once you get to the playoffs, you're team still has to be very talented. Of that initial 3, only Aaron Rodgers won a SB carrying his team with spectacular play. For Manning's SB, the D played very well in the playoffs. Manning struggled at times during that run. Brady was asked to protect the ball and move the chains with short passes during his SB wins. Those NE teams looked nothing like the NE teams since Moss and Welker arrived. Flacco played better in his SB run than either Manning during his or Brady in any of his.
Russell Wilson has proven that he is good enough to win at the highest level. Wilson has proven that he can play great football at the highest level.
I'm not condemning Tannehill for playing mediocre - given his situation and inexperience. I am saying that I think it's unreasonable to expect him to make a 20-point jump in QBR and 1.5 jump in YPA with an equivalent situation to Wilson - not to mention the timely play that led him to win more games over his first two seasons than any QB in NFL history. While I think Seattle is great, I don't think that they're so great that you should assume the QB with the most wins in NFL history over his fist two seasons was only a marginal contributor. All of their high-level efficiency stats tie back to Wilson. He's the one making the big plays for that offense, and he did it with a banged up O-line and below average WR's.
Tannehill has a chance to become a great player; Wilson has already put together great seasons. I'm just saying, let Tannehill ACTUALLY DO IT before seriously trying to compare him to a QB in Wilson who has been a historic success through two seasons.