I can resolve this. While terms like “Great One” and other honorifics are used for the Sorcerer Monarch, in The Cerulean Storm the SMs use familiar language towards each other, such as using their names, and reserve the honorifics for Borys. It’s unlikely that Borys micromanages the SMs, acting as a Roman style princeps, the first among equals.
I would argue that the team you present may be able to bring down a single Sorcerer Monarch. But the Sorcerer Monarch’s in coordination? Not likely.
I am reminded of Kalak psionically disintegrating an incompetent templar on the steps of the ziggurat. The manifestation was so powerful that it had the side effect of Tithian feeling it in his mind. So while the SMs may not be gods, they aren’t pushovers either.
The real issue of this scenario is that Abalach-Re was there at all. And what happened certainly doesn’t match what we know of Abalach-Re being a wily mountebank. I speculated previously that she is not dead.