octobrains

Did the 100s of smelling, tasting, feeling suckers on the 8 legs of an octopus do a similar thing for the octopus brain as the evolution of hands did to ours  ?... and did the decentralised architecture of the octopus brain reduce the impact the 8 arm rich information stream had on evolving a complex central brain?

Or was it that without the single repeated architecture of the mammalian neocortex as general intelligence engine, gains made in complexity in those sensory streams were not as reusable toward the evolution of a more general intelligence ??