Jenn - I think they had to. Zombie fight, hide out, forage, zombie fight, hide out..they needed to really inject some super-story into it and they couldn't this way. Michonne is a huge fan favorite in the comic series, and it was the best way to move to that part.
(and for you Doctor Who fans - the Govenor is played by David Morrisey (aka "The Next Doctor" - Christmas episode)
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