If there are thousands of possible avenues of research, and critics have a noisy lock on truth in the sense of picking a few hundred avenues they like best, then we could easily wind up with all the critics agreeing that strategy X is just a bad idea, but also disagreeing on whether strategy A is better than strategies B or C. So I don't see disagreement among critics as proving much at all other than the critics are not perfect, which they surely would agree with; it doesn't vindicate X. There are so many more wrong research avenues than right ones.

(Imagine we have 10,000 possible research topics, 3 critics who have identified their top 10 strategies, and the critics are guaranteed to identify 'the right' strategy in those 10 but beyond that pick randomly the top 1. If someone picks research topic X which is genuinely wrong, then the critics will almost certainly all agree that that topic is indeed the wrong topic: the number of strategies endorsed by any of them just 28 strategies out of the 10,000 and 28 / 10,000 is a pretty small chance for X to get lucky and be one of them. But at the same time, will the 3 critics all rank the same strategy as the top strategy? 1/10 1/10 1/10 is not great odds either! So even though the critics have an amazing truth-finding ability in being able to shrink 10,000 all the way down to 10, they still may not agree because of their remaining noise.)