GAINESVILLE, Fla.— Caden McDonald walked into the Florida Gator s’ baseball facility on Friday afternoon with plans to study for an organic chemistry test on Monday. Instead, he learned he would be DH-ing Florida’s series-opener against Texas A&M.  While studying for his test in the team common area, he was pulled into the dugout and saw he was slated to bat eighth in the lineup. Then came some nerves. “I tried not to think about it for a little bit,” McDonald said after describing his initial surprise. “I kept doing my homework.” Florida’s recent struggles at the bottom of the order led head coach Kevin O’Sullivan to give the redshirt sophomore two-way player an opportunity to provide a spark at the plate in a crucial point of the season.  McDonald delivered.  In four plate appearances, McDonald recorded a single, a double and his first career home run, sparking the Gators to a 9-2 win over the Aggies .  O’Sullivan said McDonald’s moments were well-earned.  “The underlying…