What the above demonstrates is that the spatial deflection, 2GM/Rc^2, is not angular deflection. That is, radian does not equal radius. In fact it easily demonstrated with the straight flight path, gravity free, tangent intersecting with the eye of the observer tangent, that spatial deflection measured in terms of radius causes an angular deflection of twice that. R=2R as you might say. The mathematics of gravity has not broken down. It was the wrong formula in the first place. A simple piece of Euclidean logic was all that was needed to show that 4GM/Rc^2 was the right formula for anglular deflection and 2GM/Rc^2 the right formula for spatial deflection.