"A test, for lack of better term... I guess this has to be done, whatever it is." Dexter whispered, 'quoting' Takeshi and thinking about what that 'test' could have actually been, before waiting for anyone else there to talk.
The training was difficult and Dexter couldn't deny that, but it was needed for him to perform well his new role; also, the boy felt like this new life was his destiny. He was the only one that saw that Beast, around one month before, so he must have been someone different from the others, maybe special...