100% gravity does not exist. It is a total fabrication.
At the risk of confusing the issue at hand, that statement might be closer to truth than you realise ( or intended ) what we interpret as gravity is distortion of space-time by mass, so does gravity really exist. I don't know that there is an easy answer to that, some might say that on a galactic scale our understanding of gravity is flawed, in the sense it doesn't match observed galactic rotation profiles, so dark matter is proposed as a kind of fudge factor. Although it might still be proven to be exist.
Back on less than galactic scales, the force we call gravity behaves exactly according to Newton, and it's predictions are accurate. The denspressure theory neglects to explain why some things are heavier than others, what causes the density to change from the bowling ball to the tennis ball? The mass per unit volume is different, we know what volume is, so what determines the force acting on the mass to cause the density to be different? Gravity.
Why does the bowling ball weigh more than the tennis ball in denspressure theory?