By Robin Lundberg Can Tyler Herro justify his contract? Will Jimmy Butler ever win it all? Here are the biggest factors for the Heat this year. Here are the three biggest questions facing the Miami Heat. Can Tyler Herro justify his contract?Tyler Herro got paid; now he must make that pay off for Miami. Herro is such an important piece for the Heat, because he is one of the few players on the roster who can create a shot. He’s going to have to do that consistently for them to continue to compete in the East. Does Bam Adebayo need to score more?Bam is a valuable and versatile defensive piece, bu…