"One of the two"

John Hawks says:

UPDATE (11/8/2006): My colleague, Greg Cochran, has a post at GNXP discussing introgression and microcephalin further:

If this pans out the way we think it will, introgression from Neanderthals (and maybe with other archaics) may have been one of the two fundamental patterns underlying recent human evolution.

One of the two.

[my emphasis -Razib] What could John Hawks mean??? 1) Look at the category I placed this post under 2) Oh yes...a new round of teasing starts. But you won't have to wait that long this time....