People are oblivious when they want to be, Ally. And, Bahamut love him, Tiberius was never the sharpest stick in the bundle. It should have been pretty obvious just by the time I got back.
This isn't your fault. Chromatics. They've got a lot of tricks. No matter what you'd done, he likely would have found a way out. Maybe it would have taken another decade, another century. This way, we're going to kill him and be done with it.