Both books have some suggestion that the Q and other similars have fled because of the threat.
I really don’t think anything we’ve seen or heard suggests that the Devidians could be a threat to the Q. Is there something else going on and the Devidians are just taking advantages of it?
When the universe was threatened by “Them” Q mounted a resistance with the Q of the Enterprise. But now he’s scared and runs away from something that uses space serpents that can be killed by starfleet ships and need to take out methods of time travel to stop their plans being scuppered?
SSH. No one said pulling some one-off villain from the TV shows and making them super powerful threats is supposed to make actual sense.
(It all started with Khan. XD)