This article is a guest post written by the excellent Cory Kinnan, who publishes the excellent Daft on Draft blog, which includes weekly reviews of NFL Draft prospects from the college football season and in-depth breakdowns of quarterback prospects, including the weighted on-target percentage metric. Please consider subscribing to Daft on Draft. Ohio State quarterback Julian Sayin has been under the microscope early on in his college football career. And for good reason. He’s a five-star quarte…