I hadn't the book under hand when I wrote it up, but yeah, it is that flaw.
The tricky things, it is when you mimic someone, you not only taking his good powers, but his bad too, so the problem I may see, is that after I mimic one person, I lose my mimic power (as the subject will surely not have it) and by that, I won't be able to mimic more than one person at the time anymore... and if there is a way to mimic more than one person, what happen, does I have the best of both or the worst of both... that the most tricky thing.