Ignoring how long it'd take to get Perception: People and Objects to both 150, or whether that's even feasible.
At max against Supernatural Opponents, MMA would be at top 450 - 100 = 350.
Like I mentioned earlier, I just don't particularly like the idea of Hayato upgrading either Karate or Kendo for future synchronization with Yato, since both of them are in fact not his main Martial Art. It feel's like it would be in-universe, the equivalent of using a subpar engine for a car.
I know it would take long time, this is for the future, considering how high our MMA and other related skills already are. And it wouldn't be used against supernatural opponents, we have UMT and any other Supernatural/Partner Arts for that.
For me it is the exact opposite, I wan to keep at least MMA as mundane since it is his main Mundane art, thus the one he would use in tournaments and in mundane fights. UMT is his main non-mundane art, and has no problems with mixing with other arts, whether Supernatural or another Partner art in the future.
Sorry, the way you worded it made it seem like this decision is the one that will decide whether or not Hayato and Yamato can keep their secret from anyone.
That's fair, and I'm not worried about him being dropped out, I just want him to be the best he can in the mundane world with his main Mundane Art, to be able to raise to the top of MMA without being held back by the fact that he's forced to hold back due to it not being mundane. And we're part of the MMA club, we're going to ab partaking in MMA tournaments, this tournament is a special case. And I doubt those boosts improve, since that's coming from a perk.
But you're right, I too get your point, just disagree with it as the course of action. Time for the voters to decide.