While I don't believe this 4chan PSO2 ARKS leak, but the other leak (also 4chan
) says Matoi is in consideration is kinda growing in the Japanese speculation scene.
The leak itself isn't taken seriously of course but people are interested in the idea of PSO2 contents making the cut in Smash which sounds weirdly plausible since the series is so tied with Sakurai's personal history.
PSO2 is the money maker of SEGA today and PSO2:NGS is right around the corner, so it is kinda understandable it'll get chosen as the next SEGA rep over Puyo Puyo or Yakuza since both series has their issues to get in Smash.
Also, this.
Seems like this is the only verified official company account not directly involved with Smash Ultimate but still celebrated the release of it.
Remember, there was one team that also celebrated the heck out of it when Ultimate released even on their official streams multiple times despite not involved with it at all for some unknown reason?
Dragon Quest