17) Who may authoritatively arbitrate between Christians who claim to be led by the Holy Spirit into mutually contradictory interpretations of the Bible?

The point this Question is making is obscure, but I believe the following accurately restates it:

Sola scriptura says Scripture is the final authority, but scripture is dumb, it doesn't speak for itself. When two Christians arrive at mutually contradictory interpretations, there is no Arbiter to choose who is right, therefore sola scriptura cannot distinguish truth from falsehood.

This straw man hypothetical is inconsistent with objective fact and self contradictory.

1)Its self contradictory as sola scriptura did enable one of these two arrive at the truth, hence it can distinguish truth from falsehood.

2)Its an absurd hypothetical. Sola scripturaists don't disagree what explicit scripture says, and only where scripture is explicit can it be said to have "ruled" on a subject. No arbiter is needed for that.

3)When two Christians cannot agree whose speculation is correct, that is irrelevant, immaterial and incompetent to whether scripture can be correctly exposited or if God's Word is the Final authority.

The subtext of this question was addressed in Question 16. Christian speculation about doctrine not explicitly taught in scripture is irrelevant to sola scriptura.

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The times of this ignorance God winked at; but now commandeth all men every where to repent:

Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.-kjv