Adam Dunn on the Reds, he was a Quarterback at Texas. He would have played but wanted to concentrate on baseball but was recruited and given a football scholarship. All broadcasters talk about his football skills and how he used to play football. They say every now and then, he goes to workkout and practice with the Bengals. He should go to the Bengals as a back up QB to Carson Palmer. Not to mention, he is not the only Reds player that played football also. Deion Sanders and Drew Henson who was a Quarterback.
Carlos Zambrano as a linebacker or a defensive end, he's a big strong athletic guy and they say he play different positions in batting practice. He shows his strength when he's mad breaking bats over his thigh. Once again, I think he should go to the Bengals, becuase they were short on linebackers last year and what the Bengals drafted this year in the first round of this year's draft. If he were to go as a Defensive End, he could go to the New York Giants to take Michael Strahan's place since he retired from the NFL.
Jose Reyes, Carl Crawford, or Jacoby Ellsbury would make great wide receivers, but I would be more tempted to put Ellsbury and Crawford as Tight Ends since their a little bit bigger guys and have a lot more strength based on power numbers and homerun production, Especially Ellsbury. Similar to Jeremy Shockey now with the Saints. Although Jacoby Ellsbury doesn't start everyday, his numbers aren't as good as Reyes.
This was a very interesting question. There are several ball players I could have listed on this question.