[vin13ish]

I have a feeling that Yamato WON'T be Daigo, Right or Takaharu because he have to be responsible for 4 Zyumans when they're not doing a superhero work

And plus his uncle, Mario doesn't know about 4 rangers are in fact 4 Zyumans and there's no mention about another ally, So Yamato is on his own taking care of 4 Zyumans

Maybe Yamato will be more refresh than last 3 Hot-Blooded Ranger

He cannot be super excited all the time because his behavior can put his teammate in big trouble with the authority

That's my opinion