Throk was only promoted to Hub Commander just a month after Shiro’s escape, as he was previously working as head of the Special Operations division, fine tuning the military training/schooling he received and proving his leadership capabilities. He was still under the watch of Commander Prorok as he updated the defences, (which at the time, wasn’t seen as really much of a concern). He was highly skilled and very promising commander but they weren’t going to let him run loose just yet. That was until Voltron showed just how vulnerable they really were. Suddenly raw power was ill sued and in desperate need of far more careful planning and defensive measures.