[VadeRetro]

Physicist's statement doesn't that I notice home in on geography as the source of reproductive isolation. It would appear to handle mating choice, sub-habitat specialization, etc. Besides, whatever G3K's "refutation" will be, it won't resemble our musings.

[Nebullis]

Physicist's statement doesn't that I notice home in on geography as the source of reproductive isolation.

It does because it ascribes reproductive isolation to divergency after separation rather than as a cause of separation. I don't have any loyalties to defend and G3K, obviously, doesn't have a clue, but I'm all for having bases covered ahead of time.