Yeah, Ethari is in for an emotional season 7, that's for sure.
We have end credit art that heavily implies Runaan's flower is once again on the surface, something I assume Ethari is going to notice.
How he's going to go about tracking Runaan down, I'm interested to find out. It would probably be easy enough to send word from the Moon Nexus to the Silvergrove, but I assume they're not just going to leave Runaan there and deal with the plot that way. After all this time getting Rayla and Runaan back together, I can't see them suddenly splitting up. Similarly, Rayla and Callum have finally moved beyond the awkward part of their relationship and are fully embracing being together, so I can't really see them splitting up so soon either. Especially considering the potential attack on Katolis (potential from their limited perspective), I assume Rayla is going to want to go with Callum to find out what exactly happened. (They're obviously going to both be incredibly worried about Ezran.)
Perhaps Rayla, Callum and Runaan will set out for Katolis together, sending word to Ethari that this is where they are going?
(I'm also super curious about Rayla's Ghosting. Has Ethari reversed the spell? Word of God says that not only is that difficult, Rayla is still in the Silvergrove bad books for abandoning her mission. Real sticklers for the rules, it seems).
At least Ethari will have a mount to take him out looking for his husband though, right? Coz I gotta assume that's why the shadowpaw has been sent home.
The poor muderfloof needs to rest and retire too.
