Why did troy smith get drafted so low?

Troy Smith was drafted low in the 2007 NFL Draft primarily due to concerns about his size, standing at 6 feet tall, which raised doubts about his ability to succeed as a quarterback in the NFL. Additionally, his performance in the postseason and questions about his mechanics and consistency contributed to teams being hesitant. Despite winning the Heisman Trophy in 2006, these factors overshadowed his college success, leading to his selection in the fifth round by the Baltimore Ravens.