The Problem of the Implied Guess Work Required within Special Relativity.

SR reduces all motion down to the observer.
And the observer is moving relative to the observed object.
Yet the observer exists within the universe.
Hence the observer must be moving at many different velocities relative to many different objects.
So because the observer's motion is unknown relative to all moving objects, then the observer's motion within the universe is unknowable.
As the observer's motion is unknowable, then consequently, the observed motions as related back to the observer are then unknowable.
Yet SR proposes that such motions as observed by the observer are knowable.
Hence the implied unknowability of motion within SR theory makes the theory unworkable.