Obviously not the whole truth. A number of his words don't match up with one another; likewise, his actions never have back-up.

[strife from inside, potentially from two fronts. not what they needed.]

The Master's not quite like that. He knows his limits, but he ignores them. To make up for it, he has no morality or particular care for anything but his own success. He's brilliant, and he's... [this one, at least, the Doctor wants to say. but that wouldn't help. Eliot didn't have to know their history.] ... Absolutely insane.

It's an awful combination.