I've never been in a dynasty league, but I just get this feeling about him that he'll end up switching positions or DHing before long. He had the leg muscle problems last year, and he'll likely continue to be awful at throwing out runners.
People are super high on him so I'm not sure that's a good reason to pass over him. He probably commands excellent trade value in a dynasty league.
“Most men lead lives of quiet desperation and go to the grave with the song still in them.” --Henry David Thoreau