I love imagining how the fish are almost an extension of the way the octopuses think. Octopuses seem to have quite a bit of independent cognition in each of their arms, which are wrangled by the central brain. Now they're wrangling independent fish brains instead of octopus arm brains. Incredible
Yes, that's inherent in the design. All grey matter (optimized for local intercommunication), no white matter (optimized for sending signals between regions).
Each arm has its own ganglion ("CPU") and the central unit struggles to keep up with these and keep them coordinated.