Agreed, but if polling is to be trusted right now (and, let's face it, it's all we've got) then Sanders is favored pretty heavily in Nevada and NH. Biden, as of today, in SC. The question is if Buttigieg's performance in Iowa shifts those numbers at all. If it does and the support of Sanders drops in NH and NV and Biden in SC....then we could be talking about a ridiculously close race going into Super Tuesday.
However, if Sanders comfortably wins those states he leads in, then we're talking a clear front runner status for him and one of the Buttigieg/Biden/Bloomberg guys has to drop out or they'll cannibalize each other.