Dude, I appreciate your list of awesome. None of it untrue. BUT, its been a god damn long time since any of those fights. There has been a lot of unimpressive fights since. Each one slower and more painful to watch then the last. He hasn't properly competed for an age. Every year that goes by means a lot more to a 45+ year old then to a younger chap. When was the last time Couture beat anybody convincingly? Gonzaga? That was 4 years ago.
While I will agree that he has not had any significant fights the level of my quotes he has still been fighting and competing. The problem is you can say he is old, faded, etc, but in each of his fights he did have he was competitive. Say what you want about his competition, but they were legit fighters who would have destroyed Couture if he wasn't the specimen of health that he is.
And funny enough you are trying to diminish Couture's last few fights when we could say the same about Lyoto. He had the worst fight of his career vs Shogun who matched him strike for strike. Then in the rematch he got KO'ed for the first time. Then he has the next worst fight in his career vs Rampage. Lyoto is not exactly on the upswing of his career at the moment.