Is Katsuya Murashima gonna be a heavyweight?

Usually, guys that are Katsuya Murashima's height (around 5'7") are put in the junior division, with the exception of Ishii, who moved up from it long ago. Already, Murashima has put on considerable body mass in the dojo, more than other heavyweights like Narita or Uemura. That makes me question whether Murashima is gonna be considered a heavyweight going forwards or if NJPW are gonna tell Murashima to slim down during his excursion.