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Jim, I feel Fred's pain.

He explained why your argument of converging masses was not relevant under the conditions that Einstein postulated, but you dismiss that.

He explained why inertial (F=ma) and gravitational (F=GMm/R^2) mass are not necessarily the same.

He points out how Einstein's thought experiment connects the two masses.

And you remain mystified and make incomprehensible statements like: "confusion of obstructed gravitation with the inertial obstruction"

And nonsense like: "a body moving freely in a gravitational field is always moving uniformly from its own frame of reference" -- by definition, a body is at rest in its own frame of reference, though it may be subject to a balanced set of forces, such as gravity and the normal force from a surface on which it sits.

Fred, please write your books. Your time is too valuable to waste trying to straighten out Jim's misconceptions.