One Piece exploded, even further, thanks to a rather high-quality arc that gave the manga a genuinely epic sense of scale and progression; the big "movie" event and all the marketing helped, but the core of the growth was achieved by Oda's talents as an storyteller. Regardless of S3, a movie and game, Hori won't be able to achieve that sort of "if you're not reading this, you're being left out" general pop culture appeal that Marineford accomplished. So, in my opinion, comparisons between OP's sudden massive growth and anything similar for HeroAca feel extremely misguided.