...and Chaos Terminators have a minimum squad of 5 now. The unit sizes line up with the box. It's really simple. That is; Buy new models.
They have a lot of Keywords in Sigmar that don't do anything. It's pretty dumb. However, my Blackshirt tried to reason with me on this one. By throwing in all the Keywords they can think of straight off the bat, even if half of them don't do anything, they could, one day in the future, release a model or rule that does interact with those Keywords. Maybe not now, but later.
By essentially 'Keyword dumping' on their models, they are, in some way, future-proofing their rule set, even if they never go back to it, they could. By putting in an <arbitrary name tag> on a unit, they open themselves up to make Uniques and more rules for that Sub-Faction.