Later onFatal Revenant, p. 290 wrote: "I am the Land's Creator's hold," he pronounced in melody.
Ok, so how does this fit with what we know of the Creator's involvement in the Land?Fatal Revenant, p. 294 wrote: "We were formed to stand as guardians in the Creator's stead."
Tying together several threads now, perhaps the One Tree lies within the remnant of the One Forrest during Berek's time (all forests are gone under the Sunbane, so it's not there any more) and the Creator reaching forth to help Berek create the staff may be Caerroil Wildwood doing so.
Which, if true, again makes one wonder if the new staff is the old staff? I still don't think so, but I suspect that CW "finishes" Berek's staff as well.