The Los Angeles Dodgers will likely keep a lot of their roster intact this offseason. The one player who has been floated over and over in trade rumors already, though, is Teoscar Hernandez. The right-handed slugger has been a key piece for L.A. in recent years but appears to be on the decline. He’s still got enough thump in his bat to appeal to other teams, though, and the Dodgers have a couple reasons that trading Hernandez could make sense. O…