Speaking for myself, I'm obviously not debating CC, or the that the increase in the speed of the flow is real...my contention is that CC is having a negative influence on major east coast cyclogenesis via altered tropical forcing (increase in MC phases, and decrease in central Pacific phases) as a result of the disproportionately rapid warming of the west Pacific. I'm sure the fast flow doesn't help, but I don't think it's the primary inhibitor due to the success that other areas of the globe have with amplification...ie midwest and western Atlantic (Maritimes). It's probably a combination, but it definitely seems to me to be more an issue of simply faster flow, and somewhat of a forcing issue.