I looked at my Dominator2 rim, and I would lace it as posted and the illustration showed earlier (key spoke is a trailing spoke, left of the valve stem, coming from the 4th hole from center of the hub flange). As said earlier, there are other ways to lace them that will probably not have any harmful repercussions. Searching around the forum, there is this thread, and I think the method is different (“key” spoke is a leading spoke?) but it sounds like it has proven successful as well.
My stock Dominator2 rim also has one side pulling spokes going one way and the other going the other way, (it doesn’t have disc brakes) just for information.