Body Mass Index is crap! Yes change the equation and you can get any statistic. Keep in mind that since the change to BMI, the President of the United States is considered overweight. Back in the day, he never would be considered overweight. Ridiculous, but good for those in the faux BMI business I suppose.
As for President Bush, I would think he would score reasonably well in a BMI. I doubt that BMI would show him as obese.
The fact is most people do not like the BMI because it does not flatter their own overrated physique.