I always thought that rai only stopped or contained muzaka, never really going for the kill. I agree.I think Rai was stronger- since Muzaka was trying to go for a kill even this time around seemingly picking the fight up from where he left last time. Rai was hurt and ended up sleeping for 820 years because he wasn't retaliating but only trying to stop the werewolf lord.
So Yuri put two and two together and now knows ID of Noblesse.. Crombell kept asking Franky if he was the one till last time. I guess he purposely lead the rogue werewolves after nobles to figure out who Noblesse was as well as test him( r hi and Muzaka both) out. I wonder when Muzaka decides he has had enough of Crombell or he will never...:/