CHARLOTTE, N.C. (AP) — Cam Newton’s struggles have left Matt Rhule looking for answers at quarterback. Rhule said Monday that he “can’t speculate” on who’ll be the team’s starting quarterback this Sunday when the Panthers host Tampa Bay. The Panthers’ second-year head coach said he'll “continue working” with Newton, but added that he wants to see where Sam Darnold’s shoulder is on Wednesday when the team returns to practice. Darnold remains on injured reserve, but stepped up his throwing last week.