Just read on one of the trip report blogs....looks like this might be the only cruise that was going west of Vancouver...fingers crossed! (See Below...)
"The captain came on with his nightly report about 8:00, and
explained (again) that the reason we had come up on the west side of
Vancouver Island on the northbound portion of our cruise rather than
coming up the Inside Passage was because anytime a new ship cruises
Alaska for the first time, it has to be certified (I don't think
that's the word he used, though), that it is able to navigate the
rather narrow passage safely. Our cruise is the only Disney Alaska
cruise that is scheduled to go north the way we did - all of the
others will cruise the Inside Passage both north and south. (Good
news for anyone who is worried about being seasick, since they
should not experience the rough seas that we had on our second day."