To be honest, I would not be at all surprised if the big difference actually did turn out to have something to do with the bond between Tsuna and his family. XD

Yeah, I know there's a big chance it'll be that, but the ninth just sounds so mysterious about it.

They're probably not gonna be in the rest of the arc, either, at this rate. Unless they somehow find out what's going on and sneak on the boat, or something...

Maybe now since Ryohei's gotten the upgrade, he can test out his healing on Yamamocchan?