I prefer the overmind as it is more insect like. The existing zerg must mutate a new overmind and kill off kerrigan. Why should zerg be run by a human-zerg hybrid? It is like having the Terran being run by a Zerg foot-soldier like a Hydralisk. Bring back an overlord..
The overmind must control most of the Zerg. Let Kerrigan have her offshoot zerg forces. It is inherent in Zerg biology for it to be rules by a superior insect collective mind . The overlord was killed, but it can be re-spawned! It can re-evolve. It is not egocentric like Kerrigan, it is a group type mind.
The poll is too few....... if i was to vote id let nova or raynor be zerg and act as her generals, (now they can make half-zerg babies yay!! the 1st adam & eve of the zerg with lilith as nova hahaha)
The forces become too big for Kerrigan to control, and some break-away, and unite to form a cerebrate which eventually mutates into a new improved and darker overlord. It undermines the power of the swarm, being ruled by a human.
Or the Xel'naga create their own overmind to take control and use the swarm to destroy their failed experiments?
or the humans go nuts and make artificial insemination among the zerg larvae and domesticate it then train to become the next generation of their species gaining some traits of the zerg i.e. super regeneration = wolverine is born.....