And Doc Mitchell didn't tell you that when you woke up? Maybe he didn't fix you, he had a mechanic friend he asked for a favor.
Put yourself in Doc Mitchells shoes... If I found a super high-tech android that I just happened to be capable of re-building, would I fix it, tell it, and show it the door? Or would I fix it,
program it to do my bidding,
not tell it, and then show it the door?