Just look at the example of Trey Brewer. He placed low in this past years nationals if I remember right. He looked worse than he had the year before. Looked years older and had nowhere the physique he had the previous year. He bulked up to well over 300 lbs and paid the price later.
I know from my previous personal experience in bodybuilding that when I consumed massive amounts of calories, and yes most of them were quality, all I did was put on extra bodyfat. Consuming more than the amount of calories and nutrients you need to maintain and then build your muscle is going to be stored as bodyfat. You are only capable of building a minute amount of muscle in a given time, and when you take in more than is needed for that its going to fat, bottom line.
In my example I had bulked up to a riduclous 265 lbs in the effort to put on muscle. I got with Phil Hernon and within a few months I was down to 225 lbs and a little bit STRONGER. I was squating 455 lbs for 8 reps at 265 and by the time I hit 225 several months later I could easily do 455 for 12 reps.
Only reason you would get stronger while you put on fat is due to the extra leverage you get with bigger limbs and torso. This is great if youre a powerlifter, but not for bodybuilding.