I don't agree with all that either but it's nice to see more discussion.
Why would you move Cloud/Luigi down?
Greninja is a weird one, I fought Akashic and he was my first experience fighting a good Greninja, was awhile back and I got bodied a lot largely due to hydro pump. I fought Apostle and the mu seemed very manageable, he didn't mix up his camping as effectively though or maybe I just got better at dealing with it. I fought Ookami a few hours ago and it felt like a slight disadvantage while being very manageable.
That's the order I fought them, it's tough to tell though because the other two didn't hydro my up b for gimps, while at the same time I've improved a lot. I think -3 isn't unreasonable but I find -2 to be more acceptable imo.
His grab being slow, his recovery being pretty standard to edge guard, his lack of combo breaking moves, poor oos options and need to get to a very close range to do any real damage makes this very doable.
But his edge guards and shuriken camping/ledge coverage alone make this difficult at times, and if they can fstool combo well making the most of their openings things could get bad quickly.
I feel like hydro pump is so devasting to us used right that it makes the mu worse lol