Right, the issue is that Durron said "all the major favorites" don't have an answer, and GW is simply pointing out that the candidate that's arguably THE favorite among the favorites is in fact strong enough. So, not really "all".
Also, there's the issue that the wall-crashing bit was more or less calculated using rules. But afaik there are no rules at all for creating earthquakes. So that 50, while reasonable, is an unsupportable guess and thus not a particularly hard and fast rule.