User blog comment:Ramallah/Mass Effect 3 details revealed/@comment-2250460-20110411054752/@comment-1726879-20110414092352

Well, I think that they're simply running out of minions. Were the collectors not eliminated, they'd probably be the ground forces. And if I recall, a husk takes hours, and can be created in the field, but the indoctrinated on Virmire were captured and imprisoned for some time.