Trading Mac Jones mid-season would be a costly mistake for the San Francisco 49ers, even with tempting draft pick rumors swirling amid a rash of quarterback injuries across the NFL. Brock Purdy’s health history puts added value on a quality backup, and Mac Jones proved last year he can deliver in high-pressure games when needed. With half the league already relying on their QB2, can the 49ers afford to risk their depth? This Sunday’s NFC West showdown at Levi’s Stadium against the Arizona Cardinals poses another opportunity for the 49ers’ revitalized pass rush to shine. Nick Bosa and company look to exploit the Cardinals’ struggling offensive line, which cracked under relentless pressure last week. After notching four sacks against the Miami Dolphins and several pressures on Matthew Stafford, is this the year the 49ers’ pass rush moves from perceived weakness to dominant strength?