Hm. Guys? I just re-read the screenplay and Grindelwald spent all of two days in New York. He didn’t impersonate Graves for months. Newt arrives in NY the day after we see Grindelwald fighting those wizards at the beginning of the movie. Fantastic Beasts spans over two days. I’ll make a detailed post about this later, but we can already say that :
- Grindelwald took Graves’ place very quickly. If the man was only impersonated for two days, then it makes sense that no one noticed he wasn’t himself.
- Graves - the real one - obviously knew Credence before. Grindelwald just met him as was probably usual for the both of them and told him to find the child.
- We still don’t know where Graves is
- Grindelwald was probably in a rush. It makes sense that he got a bit carried away in trying to find the Obscurus, and therefore Newt was able to find out something was wrong. Grindelwald was stressed out. Probably had no idea how to do Graves’ job and just took it because it was a high position in the government, therefore he’d have access to more information and more freedom to move and do as he pleased.