The voters of Makefield are being used in a political power struggle that is not of their choosing. They elected a MP who has decided that he wants another person to represent them so he can challenge the sitting PM.
AIBU to say they should reject this and not vote the puppet candidate in.
Vote IABU somebody needed to stand down so there would be a credible challenge to the current leadership.
Vote IANBU an elected MP should represent the people who elected them for their full term.