This paper asks and addresses several questions. First, why don’t gravitational theories include near field gravity probes and gravity modification as part of the bigger picture? And therefore, the next question is, is the gravitational constant G a constant or a variable? Based on a study of 798 isotopes, this investigation shows that G is a variable and a function of the mass of the nuclei. Second, by showing that much of theoretical physics is cantered on the field structure, not the source, the paper asks the question, is mass the source of gravitational fields or is it a proxy for some other property of matter? By making some extrapolations of quark masses, the paper shows how quark motion, not quark mass, is the source of gravitational fields. Higgs field implicitly assumes that mass is a property that is external or extrinsic to the property of the particle. Finally, by asking the question is it possible to derive a description of mass that is intrinsic to the particle, and to its existing properties? Is it possible to derive a property of mass without adding anything new? By deriving a different mass model from Higgs Field, a particle structure that is consistent with both mass-based and massless particles is derived. This mass model suggests that the law of conservation of mass is not as fundamental as we thought it is. That particle radius plays an important part in this conservation law and could lead to the answer of the proton radius puzzle.