> Kook was a gadol before he went off the derech.
> You can see the handwritten letter online by Rav Elchonon Wasserman ztz”l who called him a “rushe gumir”.
You got to have pretty serious reasons to consider a gadol to become OTD … Just because another person of the same stature disagreed with him on politics may be too risky, and leaves you no method to analyze disagreements between modern Talmidei Chachamim. At best, you yourself are choosing one Rav v. the other and claim that you are following a gadol; at worst, you are following what you learned from your heder rebbe, an accident of birth rather than a thought-through opinion.
To appreciate the problem, I suggest reading a sefer “making of the gadol” that may not necessarily address this hot issue, but it contains a lot of factual material about R Kamenetsky and others lives – and see if any of the details go against the stereotypes we have. This will help you appreciate how much we really know before making judgments on people.