Heyward was only injured one year (the year he sucked). If you're talking about health, Kershaw's hip waves hello.
That is what I get for trusting my memory. Most of the point still stands. Heyward doesn't have a great track record yet and in pretty much any draft, Kershaw is going to go ahead of Heyward. I am actually a big fan of Heyward and tried to get him in every keeper league I play in but if someone was to offer me Kershaw for him, I would do it in a second. People seem to forget that Kershaw is only 24 and while he has put a lot of innings on that arm, there is very little to be concerned about. From all reports, the hip is fine.