1. I don't remember Kenshiro learning it from Toki but it's possible. Also, you just said that Raoh probably doesn't know about the healing part so how can he be using the same techniques as Toki? As said already, they all use different techniques, yet these techniques are all part of the same style.
2. See, all that didn't happen in the manga. I do remember that happening in the anime though.
Toki doesn't use healing when fighting. And wasn't it Toki that figured out you could heal with it? And something about the pressure put on certain points can either heal or destroy. Raoh wouldn't waste his time with the finesse of healing. It's all the same techniques just used in different ways.
That all happens in the manga. I have no idea how much more happens in the anime or if its all the same. I haven't seen it in god knows how many years. I just look junk up in the manga online.
__________________ If you try something stupid, and it works it ain't stupid.
1. Toki doesn't use it while fighting but it's still part of Hokuto and you don't see Kenshiro healing people like Toki does (or at least not as often). I believe it still does effect his fighting skill, as it could have some type of effect on the either the opponent or the user.