By Kevin Sweeney SI’s annual narrowing of the pool from which April’s champion will emerge. Welcome back to Sports Illustrated’s Magic Eight! With 25 days until Selection Sunday, it’s time to lock in some picks for what will happen once the calendar flips to March. The annual goal of the Magic Eight is simple: Identify the eight teams that can win the national championship and separate the contenders from the pretenders in the process. My colleague Molly Geary did an admirable job last season. Among her Magic Eight were three of the four Final Four teams (including champion Baylor and runner-u…