In order to explore reliable consequences of the pion theory of nuclear forces at high energies, the p-p scattering at 90 Mev is discussed in detail. No evidence has been found to show that the static pion-theoretical potential is appreciably modified up to 100 Mev. This conclusion is in conflict with the prediction of very strong spin-orbit coupling potentials recently made by Signell and Marshak and by Gammel and Thaler. Especially, it is discussed that the former spinorbit term was introduced in reliance on Gartenhaus' potential at small inter-nucleon distances. These spin-orbit coupling potentials are unreasonably strong from the pion-theoretical view-point. Importance of the 3P2-3F2 coupling parameter in determining angular distributions is pointed out.