Cetus is technically one of the Iberian Inquisition's Most Wanted. There's nothing technically preventing him from going back but his operator archives highly recommend against sending him on Iberian based operations until Kal'tsit and the logistics team can work around all the red tape surrounding his record. He's guilty of some crimes like thievery (because he was starving) and assault (getting into fights for various reasons) but there's also a fair number of crimes that were simply pinned onto him because of the disparaging view of Aegir and the desire by the Inquisition to apprehend someone related to The Great Silence - for the chance to interrogate him. Even though the Inquisition still openly has beef with him, Rhodes has afforded him protection and due to Kal's negotiations he's able to safely assist on the Stultifera Navis operation.