With no spring transfer portal window in 2026, college football rosters for the upcoming season are mostly finalized as of mid-May— barring any extreme cases . That means it’s time to take a look at the most important position on the field for the sport’s top programs: the quarterbacks.  Spring ball is now complete, and with the insight we’ve gained from a busy offseason and early practices, Sports Illustrated will project every Power 4 starting quarterback, as well as a handful of Group of 6 signal-callers over the next couple of weeks. We’ll also include a confidence meter, based on how certain we are that the named quarterback will be the one that trots out onto the field for his team in Week 1.  The Big Ten is the perfect test case for this upcoming season. A handful of high-profile transfers, including one with the defending champion Indiana Hoosiers, will join some of the best returners in the sport in 2026.…