Eh, for some reason I thought it was around the same time. I guess over time memories start overlapping each other and you forget the order of events. Anyway the point is I don't think that they wanted to show to suddenly become the Worf show. Plus this was a change mandated by Paramount so it may have been a bit of a protest move by not using Worf a lot that year. But once they began using him they realized how well he fit in so they used him more.