OK. Both teams I challenged responded.
In truth, the subtle reason for my challenge was to try to find the informant. I was hoping that the informants would want me to vote for them so as not to vote for the spies. Thus if one of these two teams are informants, they would stay quiet. If both speak up, then my next most likely informant team would be Jd-/KL (based mostly on intuition).
Miaka's response along the lines "I can't play" doesn't mean much, though, as falling for that trap requires some knowledge of the game. Kleene, on the other hand, logged in shortly after my post and clearly ignored it. This makes Kleene/Miaka a prime informant suspect. If so, Kamite/Breva and Robo/Meme are innocent due to points 12) and 18) from my earlier post. In this case my prime spy suspects would be dumytru/Cider followed by Miyano/Jecka.
Another thing I was concerned about was the fact that no informant had stepped fourth to defend Robo/Meme. But now MIyano did - so if she's the informant, she may have decided it's better to pitch in and defend Robo/Meme than to steer away my vote alone. She implies that netiher Robo/Meme, nor Kain/Jellitto are on her list. At least my interpretation is that Miyano doesn't have Jellitto on her list and the four teams she listed are not on the list either. Anyway, only the informant or spy is allowed to reveal that without breaking the rules.
Unfortunately, this is the worst case scenario where both challenged teams posted, but I can't clear either of them from being the informant

.
My last informant suspect is Jd-, covering for dumytru/Cider or Kamite/Breva.
That means if Robo/Meme are civillian, I'd next vote for dumytru/Cider based on the information I have today. Another possibility would be Kamite/Breva, and hopefully I'd be able to make a more informed decision tomorrow.