A common mistake is to try and bulk and lose fat at the same time.
Another one is losing the fat and losing the muscle as well.
That is the point of the book I'm reading.
Burn the Fat, Feed the Muscle. It's pretty much the 80% of a nutritional foundation that most of should know but maybe don't.
Genetics play a big part as well. If you are primarily endomorphic, then what somebody else does will only confuse and make you frustrated. This guy might eat like a horse and do no cardio and put on 1-2 lbs of muscle a year. And you could eat exactly the same, but have a lower metabolism and gain weight.
Good food or not, if it's in excess, you will put on weight. And I don't mean muscle weight.
If you try bulk plans and just plain gain fat and very little muscle, then what fossils is saying is correct. You will need to bump up the cardio to increase the calories burned so that you only have about 500 extra calories a day for slow gain rather then 2000 extra a day which will just get stored.
If it makes any difference, it's not easy. Everybody is different. And what works for me might not work for you. But if you get that 80% of the foundation down, you will be on the fast track to success.