There’s a difference between stating facts and bragging about them. Also, you didn’t prove it either. You just stated a percentage. You can only come back against the opponents you play and their record at the time, and it also points to the quality of your own team. As far as your claimed quote by Aikman, it is just one possible reason among many and doesn’t even have to apply at all. For example, teams can go back and forth until the fourth quarter and still be close in the end with the one that is losing in the fourth quarter the one that requires a comeback victory. The point is Romo was not a choker just because he was never a winner of a SB. Pulling out victories when down and having the highest 4th quarter rating among QBs when he retired is evidence for it. His rating often got better when the game was on the line.
As to your first statement; I just played volley with MC as he does with many here. He knew his point was a lost cause because both are true. The 3 wins with Romo at QB in 2015 were against much lower than .500 opponents and the pass defense rankings were all 25th and above. He knows this so he starts playing his silly games which I won't waste my time with.
I agree you can only play (in this case, comeback) against the opponent you play. Just make sure you hold all players to that same standard and not choose your occasions to state "but his stats are only against weaker teams".
As to the win percentage; it is accurate. You simply take all of a QBs recorded comeback wins, which you obviously know by your reply, gather those opponents year-end records, then combine to determine an overall win percentage. However as always, in football the whole team matters. Not just the player. In general, unless a poster has a history of deception or outright lies, I would trust a specific value such as the one given until proven false. But that's me.
As to Aikman's comment, it has a lot of truth to it. Cowboys teams have a history of slow starts in the present century. But team was included in the statement because it takes a team to get off to a good start, unlike many here who only use the "team excuse" when it fits their pre-determined agenda.
As to Romo; my perspective is he was a very good QB and a genuinely nice guy. He had some very strange things go wrong, at the wrong times over his career and the only way I can describe it is snakebit. But at times, Romo himself was playing with the snake he was bit by. But maybe there is some truth to that saying, nice guys don't finish first (modified to fit). But I guarantee Romo isn't wallowing in, why me's and blaming others, like some of his so-called fans, because "he" is a class act. I would hazard a guess he would be embarrassed by some of the comments defending his career. His career, overall, speaks for itself.
As to some of his fans with their over-the-top defense of him, crazy post-career performance predictions, and genuine disdain for the present QB, simply because he was chosen to replace Romo.... I find it disturbing yet comical. But predictable based on the treatment Romo got back in his day. But is it worth a person's time?