@elboss: All I know is that Godaime means "5th", but that probably/definatly isn't what you meant.

Sarutobi was trained by both the first and second hokages if I remember correctly. And Yondaime definately is not mute. For one, how else could he have communicated all that "Naruto being a hero" stuff.

@drims: I can't say much due to fear of spoilerfercation, plus I've been avoiding the fillers like the plague since Curry of Life (although I'm watching this current arc), but Sakura definatly trains with Tsunade in the manga.