Shohei Ohtani has introduced a paradox to the Hot Stove: His free agency is one of the most heavily regulated in the sport’s history and yet it could inspire the greatest creativity among enterprising general managers eager to win over a 23-year-old’s heart. Here’s a still-early scouting report on the favorites to sign the pitcher/designated hitter/outfielder who dreams of revolutionizing the game in North America.