I'm putting my money on Montenegro winning the primary, because the AZGOP has lost absolutely all control in its collective life.
It would be absolutely hilarious if this ends up happening. For reference,the Democratic Party has never been really competitive in this part of the west valley, and the closest thing to a base is the small bits of Glendale in the south. Hell, Arpaio won the seat even as he was loosing in a landslide. But, if Montenegro becomes the candidate off of his banked early vote, this will be the third federal election (AL, PA-18) where the GOP sent a dead red seat into the competitive zone do to candidate quality.