RE: best system for fatloss
I know what you're saying, that's why the starting point should be person/activity level specific. Once you know where you are to remain at a weight you drop cals to begin the fat loss. Just as on a bulk you would start at a point then add cals until weight started going on. Yes that protein quantity is fine for muscle retention for a 14st guy.
On top of what they do daily they only really need the weights and the diet. No supps, no fat burners, no magic HIIT or steady state cardio at x% of your hair length or all that guff.
The fat loss method is simple, just requires will power. Treadmills, CLA, fat burners, uppers, downers, inners and outers is just going to lose money, not fat.
Eating sh*t makes you fat. Not eating sh*t and throwing iron about makes you lean. All the rest is fitness industry nonsense to make money.
People have been muscular and lean longer than protein shakes and treadmills have been around, there's nothing clever here. No "shocking" or "tricking" your body required.