This paper was produced by the Hiraal Institute, which is based in Somalia and has had recommendations by a "lurker". I noted these two sentences:
At its height in 2010, the Jabahaat numbered more than 8000 men....The total number of the Jabahaat fighters is therefore at least 5000 men. Their decline is both a reflection of the pressures the group has come against and also its reconfiguration away from a conventional posture to a guerrilla strategy from 2011.