Volley Fire not highlighting Scab Stalkers doesn't make any sense. Here's why

Someone mentioned something in the other thread that might actually explain this.

It’s possible that the dreg stalker is only temporarily meant to be highlighted until whatever long range equivalent of the dregs gets added?
Or, similarly, there was going to be one, and the enemy was cut, and they had no choice but to put that on the dreg stalker to avoid making a useless feat.