Brothers expected to be on opposite sidelines Saturday, although only one will start Consider these ingredients for what seemed like a fascinating storyline. —Quarterback Will Plummer started the final six games of the 2021 season for Arizona as a redshirt freshman, including the Wildcats’ only victory of the season, a 10-3 win over Cal. —Quarterback Jack Plummer, Will’s older brother, transferred from Purdue to Cal in December 2021 to become the Golden Bears starting quarterback in 2022. —Saturday, Sept. 24, 2022, the date Cal hosts Arizona in the Pac-12 season opener for both teams. Quarterback brother vs. quarterback brother in…