I'm sure I read somewhere Keita Amemiya's said that Kouga and Kaoru won't be coming back in this, but surely this and the episode that revealed Kouga isn't dead, this has to be building to the return of Kouga Saejima at some point. Whether it's the end of this season, next season or a movie, I don't get why it would even be brought up if Raiga wasn't going to meet his parents again. Gonza's telling Mayuri about wanting to prepare the house ready for the day they return was another one pointing in this direction.
I hate it when people think Raiga's story somehow HAS TO end with the Garo armor losing it's shine, linking it to Ryuga obtaining it sometime later, but there must be a reason they even brought up any hint of Kouga and Kaoru's fate after Soukoku no Maryu.
I hope now we're past the midway point and got a clipshow out of the way, the remainder of Makai No Hana is REALLY going to pick up.