I disagree, and I tell you Why.
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. In Acting Lessons MC's Ex girlfriend was important, because she left an emotional Scar on MC, that experience defined him. It was an unfinished business so to speak.
But Badik MC and Zoe does not have this unfinished business. There is no emotional connection anymore, regrets , or anything that would make Zoe show up in the present effective. both of them moved on from each other. Even back then MC did not considered as love.
This kind of storylien that you go with, it already happened. And It Was Josy arrival. Josy is funcion as " The Ex" " the unfinished business", while Jill is the new " love" .
Zoe can't bring anything to the table. It might be rude but she is simply unimportant. She is not even plot device like Mona was.