The spotlight trained its glare on rookie QB Marcus Mariota as soon as the Titans selected him with the No. 2 overall pick in the NFL draft.If his first three games are any indication, Mariota hasn’t been hampered by the enormity of his stage. He’s put on his top hat and he’s high stepping his way through Act 1 of his professional career.The Titans may be off to a 1-2 start, but Mariota has shown he’s ready for prime time.