Fighting every 3 months? Sorry, but I don't buy it. Yes, he's fought 4 times in the last 12 months, it was vs Koschek on august 25th, then vs Hughes on december 29th, that's 4 months later, then Serra on april 19th, almost 4 months, and vs Fitch just a few days ago, almost 4 months.
His rythm is of 3 fight a year, not 4. And he is a champion, unless by injury or TUF, he should defend his title regularly.
More on this, the man fought twice on 2006, 3 times on 2007 and twice again on 2008. That 8 fights in 3 years. 8/3 is less than 3 fights a year, so stop the shit on fighting 4 times a year, he only did that on 2005. The rest of years is 2-3 fights, not that much by any means. Just ask Jeremy Horn.