You still need to place those models in coherency, but you can "grow" towards the enemy this way. When a unit has 6 or more models, every new model you place needs to be within 2" of two other models, which severely limits the speed at which you can spread out. The more strict coherency rules of 9th, the general crack down on rules spawning multiple models and no longer being able to grow beyond your starting size have made this rule no longer necessary.
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