Here is my new theory after being corrected about my timeline mistake:
Rod Reiss and that royal family servants all know that the Reiss family carry the dormant gene for titan-shifters, what I mean by that is that they can't really turn into titans-shifter but if they are consumed by other...
Re: Shingeki no Kyojin Chapter 62 Spoiler Discussion
My guess for not the next manga chapter but in general, is that Grisha was hired by Reiss to create a titan serum, to mimic the titans shifters (like the wall titans), and Grisha figured out quite early that only the Reiss family had the...