There is no quarterback controversy in Columbus this offseason. The Buckeyes return fifth-year senior and three-year starter J.T. Barrett who holds 21 different Ohio State records at the position and is 26-4 as a starter.
Barrett is the clear-cut starter, and has been since he announced his return to Ohio State last January; that's beneficial for everybody involved, including the three talented quarterbacks behind Barrett on the depth chart.
The obvious benefit to having a veteran at the quarterback position is the leadership he brings to the quarterbacks room. It gives the younger quarterbacks an opportunity to watch and observe what it takes to be successful at the position before they have to do it themselves.