Is the liner actually sitting on the ground? I know very little about above-ground pools of this type. I assumed the liner is suspended and doesn't actually reach the ground; if it does then the legs are still carrying a substantial amount of weight, certainly more than 5% (there's a lot of force resisting the lateral pressure of the water on the liner).
Those legs can't carry that kind of weight. They aren't substantial enough to carry even a few hundred pounds each. The legs mostly hold up the top of the liner while the weight rests on the ground. Imagine filling a bread sack full of water and sitting it on the floor. Takes almost no force to hold the sides up unless you start to lift it off the floor.