First, the MRBC replaced ComStar's MRB. Second, ComStar was more than willing to hand over the surviving ComGuards. Aside from the post-Jihad public relations nightmare they had to deal with, they lacked the resources to rebuild both the shattered HPG network AND the ComGuards (whose combat strength had fallen to a fraction of its pre-Jihad, let alone pre-Tukayyid, levels). Aside from their technological knowledge, they lack the financial resources, manpower, manufacturing facilities, training facilities, etc.