The Dodgers have given every indication they're still in talks to land Japanese superstar Masahiro Tanaka, even after agreeing to a record seven-year contract with their homegrown ace, Clayton Kershaw.Whether the Dodgers kick in another $140 million or so could boil down to how much they think the pitcher is worth to their World Series push and their efforts to rebuild a brand diminished under Frank McCourt. Let's look at some potential motivations for chasing Tanaka aside from the fact that he's really, really good and teams like good players:VarietyThe Dodgers wouldn't just have three or four of the two dozen most talented pitchers on earth next season, they'd have a lot of different looks to throw at hitters.