U didn't read my post on the other thread about diet that Matt posted. There is a good reason to keep fats low if u want to lean bulk year round and not have to cut so often. Water weight and sodium from carbs is easy to drop to get leaner faster, but dietary fat turns to actual BF. It's okay for a certain amount, but over eating it is way worse that over eating carbs.
water weight is one thing, but "LEAN" means 'without fat' (not without water). so if you want to stay lean (and lean bulk), that means you want to stay low in body fat percentage. getting rid of water weight is simple, but its not getting "leaner faster". lean is without body fat to begin with
Carbohydrates are responsible for fat storage in the body, not dietary fats. Carbohydrates convert to sugars in the body and these cause a release in insulin and insulin is the bodies fat storage hormone. Dietary Fat does not cause a release in insulin.
This is why people who over eat carbohydrates (like what your doing) end up becoming obese, over weight, and getting diabetes. They become insulin resistant. They burn out their pancreas producing too much insulin all the time from eating carbohydrates all the time. One of the cures, stop eating carbs and loose weight by getting on a high fat diet (a diet with 70% fat, 25% protein and virtually no carbs is one of the best weight loss/fat loss diets there is,,, both medically and in the fitness industry).
Plenty of doctors put patients on high fat, moderate protein, zero carb diets to loose weight and help with insulin sensitivity. because carbs cause fats storage, not fats.
as for how this relates to body building,, plenty of Pro's advocate a high fat, medium protein, low to no carb diet, to stay lean. Why, because they know that carbs cause the release of the bodies fats storage hormone, insulin, not fat itself.*
again, you can eat a diet of 70% fat and not only NOT get fat, but loose all your fat and get cut in the process. Your statement "dietary fat turns to actual body fat" is not true, without the presence of insulin , which is spiked by the consumption of carbohydrates.
so, imo, again bulking several thousand calories above your maintenance calories by bulking with mainly CARBS is not a great way to "lean" bulk. Your way above maintenance, You'll have trouble consuming the foods, and you'll constantly be spiking your insulin and thus fat storage.
* of course if you eat way way above your daily needs, your body in a round about way can convert protein to glucose and cause a slight spike in insulin, and thus cause some possible fat storage as well. but this is indirectly, where as Carbohydrate consumption is directly converted to glucose in the body, and the body has to do something with this raise of glucose, blood sugar (or you will die) and so there is a direct spike in insulin which job it is to get rid of the blood sugars by storing them in fat (or in muscle cells as glycogen if the muscle cells are depleted, but this is only in certain times,,,, the default is fat storage)