They were losing people left right and centre, sure it may have been too late by the time a 1/4 of the crew got spaced in Azati Prime, but by Northstar he must have realized that 12 MACOs were not a sufficient bolster to his primary force that an additional 20 or thirty Human beings who could shoot straight and kick the s*(t out of an alien scumbag twice their size trying to destroy the ancestral home world would have been a resource worth exlpoiting if only as cannon fodder?