Grindelwald actually copied all of Percival Graves memories, so he recognises Newt, knows that original!Graves is in love with him and realises that if anyone were to recognise him as a fraud, it would be Newt. He acts accordingly by treating Newt with kindness and actually defending him in front of MACUSA's council. Who better to find his obscurus than a magizoologist who has dealt with one before?
Newt is happy to see Percival but feels uneasy at the same time. His heart knows something is wrong but he can't pinpoint it. So it's a race between Grindelwald fooling Newt long enough and Newt finding out the truth and trying to protect Credence.
+ 1: Grindelwald plans on keeping Newt after they have found the obscurial + 2: Happy end between Orginal!Graves and Newt + 3: Tina accidentally finds the real, very pissed off Graves while Newt is out with fake Graves
Grindel!Graves/Newt, Original!Graves/Newt
Newt is happy to see Percival but feels uneasy at the same time. His heart knows something is wrong but he can't pinpoint it. So it's a race between Grindelwald fooling Newt long enough and Newt finding out the truth and trying to protect Credence.
+ 1: Grindelwald plans on keeping Newt after they have found the obscurial
+ 2: Happy end between Orginal!Graves and Newt
+ 3: Tina accidentally finds the real, very pissed off Graves while Newt is out with fake Graves