GAINESVILLE, Fla. — The Florida Gators will have their starting running back Montrell Johnson back on the field this Saturday against Miami. The senior running back was atop the depth chart that Billy Napier and the Gators released on Wednesday night. Johnson was experiencing knee pain during the first week of fall camp. He underwent a scope during the first full week of fall camp and was listed as “week to week” as a result. The scope cleaned out some cartilage but revealed no structural damage. Johnson continued to progress throughout camp and was able to return to practice last week. Now, J…