It seems like you didn't even read my post. wtf is that essential athletic bf you're talking about you make up all these "fancy words" but it doesn't really make any sense at all! haha
I know from past experience I can afford to get down to 72kg from my current 77kg and still not be "ripped" -- which tells me i can afford to lose 5kg yet. But working backwards that means i have a surplus 5kg of adipose above and beyond my essential athletic bodyfat of ~7kg(10% of 70kg). If i do a bulk that +5kg will only increase .. and it's easy to imagine it going to +7kg. That's 7kg on top of the essential athletic bodyfat amount of 7kg. Too much fat. Good luck bulking, gains will be mostly fatty bulking from such a high bodyfat percentage.
I mean what's that shit you're trying to get at here...?! Don' t overcomplicate things so much!! I mean yeah weight loss is a measurable variable but at these small increments (0.5kg) the weight difference might probably just be because of daily fluctuation. I mean it's not that fucking hard. Lift weights while focusing on a good diet, getting enough protein and voila your body composition will change... I mean I know that I have to get rid of some bodyfat but I just focus on keeping up the intensity and eating more clean and eventhough I only lost a couple of lbs so far the mirror shows me that I definitely lost some fat... sorry if all this sounded a bit harsh but it seems like you are putting waaay too much thinking into this weight loss, body composition process and got obsessed with it which takes away energy you would better spend doing what is most important, TRAINING!!